NCT06051799

Brief Summary

The study aims to compare the effectiveness of myofascial trigger point treatment using pressure release versus a control group in patients with mechanical neck pain, randomly assigned. In both groups a protocol of therapeutic exercise and postural correction will be carried out

Trial Health

43
At Risk

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Trial has exceeded expected completion date
Enrollment
104

participants targeted

Target at P50-P75 for not_applicable

Timeline
Completed

Started Sep 2023

Geographic Reach
1 country

1 active site

Status
unknown

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

September 14, 2023

Completed
11 days until next milestone

First Posted

Study publicly available on registry

September 25, 2023

Completed
Same day until next milestone

Study Start

First participant enrolled

September 25, 2023

Completed
10 months until next milestone

Primary Completion

Last participant's last visit for primary outcome

July 31, 2024

Completed
2 months until next milestone

Study Completion

Last participant's last visit for all outcomes

September 20, 2024

Completed
Last Updated

September 25, 2023

Status Verified

September 1, 2023

Enrollment Period

10 months

First QC Date

September 14, 2023

Last Update Submit

September 20, 2023

Conditions

Keywords

upper trapeziussternocleidomastoidmanual therapytrigger pointsMyofascial pain syndrometherapeutic exercise

Outcome Measures

Primary Outcomes (15)

  • Visual analogue scale. Base

    Measure of pain intensity. A mark is placed on a 10-centimetre line with the left end being no pain at all and the right end being the worst pain imaginable.

    Baseline. Prior to the first treatment session

  • Visual analogue scale. Post treatment

    Measure of pain intensity. A mark is placed on a 10-centimetre line with the left end being no pain at all and the right end being the worst pain imaginable.

    Up to 4 weeks. After the end protocol of four treatment sessions

  • Visual analogue scale. Follow up

    Measure of pain intensity. A mark is placed on a 10-centimetre line with the left end being no pain at all and the right end being the worst pain imaginable.

    Follow-up two weeks after the end of the four-session treatment protocol

  • Pressure pain threshold. Base

    Measurement of pain threshold to pressure with Fischer algometer. The algometer is placed perpendicular to the myofascial trigger point previously marked by the therapist. Once in place, the pressure is increased at a rate of 1 kilogram per second (kg per sec) until the patient begins to feel discomfort. At this point, the application is stopped. Three measurements are taken and the average is calculated.

    Baseline. Prior to the first treatment session

  • Pressure pain threshold. Post treatment

    Measurement of pain threshold to pressure with Fischer algometer. The algometer is placed perpendicular to the myofascial trigger point previously marked by the therapist. Once in place, the pressure is increased at a rate of 1 kilogram per second (kg per sec) until the patient begins to feel discomfort. At this point, the application is stopped. Three measurements are taken and the average is calculated.

    Up to 4 weeks. After the end protocol of four treatment sessions

  • Pressure pain threshold. Follow up

    Measurement of pain threshold to pressure with Fischer algometer. The algometer is placed perpendicular to the myofascial trigger point previously marked by the therapist. Once in place, the pressure is increased at a rate of 1 kilogram per second (kg per sec) until the patient begins to feel discomfort. At this point, the application is stopped. Three measurements are taken and the average is calculated.

    Follow-up two weeks after the end of the four-session treatment protocol

  • Cervical Disability Index. Base

    Results on the Northwick Park Cervical Spine Disability Questionnaire, translated and validated in Spanish. The pre-questionnaire consists of 9 questions related to pain intensity, sleep, weight bearing, leisure and social activities, work and driving. Each question has 5 possible answers ranging from 0 to 4, where 0 represents the absence of disability and 4 the maximum degree of disability. Similarly, the subsequent questionnaire consists of 10 questions and the same answers. Taking this into account, the maximum score that can be obtained would be 36 in the pre-questionnaire or 40 in the post-questionnaire (categorised as high disability).

    Baseline. Prior to the first treatment session

  • Cervical Disability Index. Post treatment

    Results on the Northwick Park Cervical Spine Disability Questionnaire, translated and validated in Spanish. The pre-questionnaire consists of 9 questions related to pain intensity, sleep, weight bearing, leisure and social activities, work and driving. Each question has 5 possible answers ranging from 0 to 4, where 0 represents the absence of disability and 4 the maximum degree of disability. Similarly, the subsequent questionnaire consists of 10 questions and the same answers. Taking this into account, the maximum score that can be obtained would be 36 in the pre-questionnaire or 40 in the post-questionnaire (categorised as high disability).

    Up to 4 weeks. After the end protocol of four treatment sessions

  • Cervical Disability Index. Follow up

    Results on the Northwick Park Cervical Spine Disability Questionnaire, translated and validated in Spanish. The pre-questionnaire consists of 9 questions related to pain intensity, sleep, weight bearing, leisure and social activities, work and driving. Each question has 5 possible answers ranging from 0 to 4, where 0 represents the absence of disability and 4 the maximum degree of disability. Similarly, the subsequent questionnaire consists of 10 questions and the same answers. Taking this into account, the maximum score that can be obtained would be 36 in the pre-questionnaire or 40 in the post-questionnaire (categorised as high disability).

    Follow-up two weeks after the end of the four-session treatment protocol

  • Pain catastrophising scale. Base

    It is the set of cognitive and emotional processes consisting of having negative thoughts about the future that predispose to the chronification of pain. Self-administered scale made up of 13 items, each item scored from 0 to 4. The total score range is from 0 to 52, where higher scores indicate a higher level of catastrophism. It is one of the most widely used to assess the pain catastrophising construct.

    Baseline. Prior to the first treatment session.

  • Pain catastrophising scale. Post treatment

    It is the set of cognitive and emotional processes consisting of having negative thoughts about the future that predispose to the chronification of pain. Self-administered scale made up of 13 items, each item scored from 0 to 4. The total score range is from 0 to 52, where higher scores indicate a higher level of catastrophism. It is one of the most widely used to assess the pain catastrophising construct.

    Up to 4 weeks. After the end protocol of four treatment sessions

  • Pain catastrophising scale. Follow up

    It is the set of cognitive and emotional processes consisting of having negative thoughts about the future that predispose to the chronification of pain. Self-administered scale made up of 13 items, each item scored from 0 to 4. The total score range is from 0 to 52, where higher scores indicate a higher level of catastrophism. It is one of the most widely used to assess the pain catastrophising construct.

    Follow-up two weeks after the end of the four-session treatment protocol

  • Tampa Kinesiophobia Scale (ETK-11). Base

    Translated into Spanish. It is one of the most frequently used measures to assess pain-related fear of movement in patients with chronic pain. The ETK-11 is an 11-item self-questionnaire in its Spanish version that measures fear of movement and pain. The total score of the ETK-11 is between 11 - 44 points and each item has a likert scale that scores from 1 to 4 (1 = strongly disagree, 4 = strongly agree). Higher scores indicate greater fear of movement and pain. The ETK-11 has two subscales: activity avoidance and harm avoidance.

    Baseline. Prior to the first treatment session.

  • Tampa Kinesiophobia Scale (ETK-11). Post treatment

    Translated into Spanish. It is one of the most frequently used measures to assess pain-related fear of movement in patients with chronic pain. The ETK-11 is an 11-item self-questionnaire in its Spanish version that measures fear of movement and pain. The total score of the ETK-11 is between 11 - 44 points and each item has a likert scale that scores from 1 to 4 (1 = strongly disagree, 4 = strongly agree). Higher scores indicate greater fear of movement and pain. The ETK-11 has two subscales: activity avoidance and harm avoidance.

    Up to 4 weeks. After the end protocol of four treatment sessions

  • Tampa Kinesiophobia Scale (ETK-11). Follow up

    Translated into Spanish. It is one of the most frequently used measures to assess pain-related fear of movement in patients with chronic pain. The ETK-11 is an 11-item self-questionnaire in its Spanish version that measures fear of movement and pain. The total score of the ETK-11 is between 11 - 44 points and each item has a likert scale that scores from 1 to 4 (1 = strongly disagree, 4 = strongly agree). Higher scores indicate greater fear of movement and pain. The ETK-11 has two subscales: activity avoidance and harm avoidance.

    Follow-up two weeks after the end of the four-session treatment protocol

Secondary Outcomes (12)

  • Swallow-wall distance. Base

    Baseline. Prior to the first treatment session.

  • Swallow-wall distance. Post treatment

    Up to 4 weeks. After the end protocol of four treatment sessions

  • Swallow-wall distance. Follow up

    Follow-up two weeks after the end of the four-session treatment protocol

  • Cervical flexion-extension. Base

    Baseline. Prior to the first treatment session.

  • Cervical flexion-extension. Post treatment

    Up to 4 weeks. After the end protocol of four treatment sessions.

  • +7 more secondary outcomes

Study Arms (2)

TREATMENT GROUP

EXPERIMENTAL

The Pressure Release Technique will be applied. One session per week will be carried out for four weeks. It will be performed on as many trigger points as we find in each muscle associated with the study, leaving a record of them. Also adding postural hygiene and home exercise guidelines. A progression of exercises involving contraction of the deep neck flexor muscles Subjects will be taught to perform slow and controlled craniocervical flexion. It should be performed a minimum of once daily during the treatment regimen. A follow-up of the patients will be carried out with respect to home therapeutic exercise and postural hygiene guidelines.

Other: Myofascial trigger points pressure releaseOther: Therapeutic exercise and postural hygiene

CONTROL

ACTIVE COMPARATOR

Postural hygiene guidelines will be given, as well as home therapeutic exercise (identical to the treatment group). About therapeutic exercise, a progression of exercises involving contraction of the deep neck flexor muscles shall be included in the first session. Subjects will be taught to perform slow and controlled craniocervical flexion. Subjects will then be trained to be able to progressively maintain craniocervical flexion through feedback from an air device (Stabilizer™, Chattanooga Group Inc., Chattanooga, TN) placed behind the neck. This sensor monitors the slight flattening of the cervical curve that occurs with contraction of the craniocervical deep flexor musculature. It should be performed a minimum of once daily during the treatment regimen. To this end, patients will be monitored and their understanding and correct follow-up of the treatment will be assessed in each face-to-face session per week, for four weeks, the same as in experimental group.

Other: Therapeutic exercise and postural hygiene

Interventions

Patient lying down in the supine position, Therapist do a first and second finger pincer grasp is performed on the myofascial trigger points located on the upper trapezius muscle and sternocleidomastoid muscle, this pressure will be increased as the therapist perceives a reduction in soft tissue resistance under the finger over a period of 90 seconds. Previous studies indicate no difference between 60 and 90 seconds of pressure. It will be performed on as many trigger points as we find in each muscle associated with the study.

Also known as: Ischemic compression, pressure release, manual compression
TREATMENT GROUP

Therapeutic exercise and postural hygiene: A progression of exercises with contraction of the deep neck flexor muscles will be included in the first session. Subjects will be taught to perform a slow and controlled craniocervical flexion. Subjects will then be trained to be able to progressively maintain craniocervical flexion through feedback from an air device (Stabilizer™, Chattanooga Group Inc., Chattanooga, TN) placed behind the neck. This sensor monitors the slight flattening of the cervical curve that occurs with contraction of the craniocervical deep flexor musculature. It should be performed at least once a day during the treatment regimen. Also Postural correction exercises carried out regularly throughout the day, especially when seated. Indications are given to avoid pelvic retroversion and maintain a natural lumbar lordosis while performing retraction and adduction of the scapulae and gently lengthening the spine.

Also known as: postural correction, motor control exercise
CONTROLTREATMENT GROUP

Eligibility Criteria

Age18 Years - 55 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64)

You may qualify if:

  • Subjects between 18 and 55 years of age in order to avoid degenerative phenomena.
  • Have suffered from neck pain at least once in the last month.
  • Active or latent myofascial trigger points in the Upper Trapezius and Sternocleidomastoid muscles.

You may not qualify if:

  • Patients with recent trauma (last 6 months) to the upper quadrant or spine.
  • Patients with pathologies involving malignant neoplasms.
  • Surgery on the trunk or upper limb in the last six months.
  • Patients undergoing pharmacological or physiotherapy treatment at the time of the test.
  • Pregnancy.
  • No myofascial trigger points in the upper trapezius or sternocleidomastoid muscles.
  • Refusal to sign the consent form for the study or not being able to do so.

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Fisioterapia Los Molinos

Getafe, Madrid, 28906, Spain

RECRUITING

Related Publications (26)

  • Munoz-Munoz S, Munoz-Garcia MT, Alburquerque-Sendin F, Arroyo-Morales M, Fernandez-de-las-Penas C. Myofascial trigger points, pain, disability, and sleep quality in individuals with mechanical neck pain. J Manipulative Physiol Ther. 2012 Oct;35(8):608-13. doi: 10.1016/j.jmpt.2012.09.003.

  • Cerezo-Tellez E, Torres-Lacomba M, Mayoral-Del Moral O, Sanchez-Sanchez B, Dommerholt J, Gutierrez-Ortega C. Prevalence of Myofascial Pain Syndrome in Chronic Non-Specific Neck Pain: A Population-Based Cross-Sectional Descriptive Study. Pain Med. 2016 Dec;17(12):2369-2377. doi: 10.1093/pm/pnw114. Epub 2016 Jun 20.

  • Chao YW, Lin JJ, Yang JL, Wang WT. Kinesio taping and manual pressure release: Short-term effects in subjects with myofasical trigger point. J Hand Ther. 2016 Jan-Mar;29(1):23-9. doi: 10.1016/j.jht.2015.10.003. Epub 2015 Nov 6.

  • Grieve R, Barnett S, Coghill N, Cramp F. The prevalence of latent myofascial trigger points and diagnostic criteria of the triceps surae and upper trapezius: a cross sectional study. Physiotherapy. 2013 Dec;99(4):278-84. doi: 10.1016/j.physio.2013.04.002. Epub 2013 Jul 2.

  • Oliveira-Campelo NM, de Melo CA, Alburquerque-Sendin F, Machado JP. Short- and medium-term effects of manual therapy on cervical active range of motion and pressure pain sensitivity in latent myofascial pain of the upper trapezius muscle: a randomized controlled trial. J Manipulative Physiol Ther. 2013 Jun;36(5):300-9. doi: 10.1016/j.jmpt.2013.04.008. Epub 2013 Jun 12.

  • Cagnie B, Castelein B, Pollie F, Steelant L, Verhoeyen H, Cools A. Evidence for the Use of Ischemic Compression and Dry Needling in the Management of Trigger Points of the Upper Trapezius in Patients with Neck Pain: A Systematic Review. Am J Phys Med Rehabil. 2015 Jul;94(7):573-83. doi: 10.1097/PHM.0000000000000266.

  • De Meulemeester KE, Castelein B, Coppieters I, Barbe T, Cools A, Cagnie B. Comparing Trigger Point Dry Needling and Manual Pressure Technique for the Management of Myofascial Neck/Shoulder Pain: A Randomized Clinical Trial. J Manipulative Physiol Ther. 2017 Jan;40(1):11-20. doi: 10.1016/j.jmpt.2016.10.008.

  • Pecos-Martin D, Ponce-Castro MJ, Jimenez-Rejano JJ, Nunez-Nagy S, Calvo-Lobo C, Gallego-Izquierdo T. Immediate effects of variable durations of pressure release technique on latent myofascial trigger points of the levator scapulae: a double-blinded randomised clinical trial. Acupunct Med. 2019 Jun;37(3):141-150. doi: 10.1136/acupmed-2018-011738. Epub 2019 May 7.

  • Fernandez-de-Las-Penas C, Dommerholt J. International Consensus on Diagnostic Criteria and Clinical Considerations of Myofascial Trigger Points: A Delphi Study. Pain Med. 2018 Jan 1;19(1):142-150. doi: 10.1093/pm/pnx207.

  • Tsiringakis G, Dimitriadis Z, Triantafylloy E, McLean S. Motor control training of deep neck flexors with pressure biofeedback improves pain and disability in patients with neck pain: A systematic review and meta-analysis. Musculoskelet Sci Pract. 2020 Dec;50:102220. doi: 10.1016/j.msksp.2020.102220. Epub 2020 Jul 24.

  • de Zoete RM, Armfield NR, McAuley JH, Chen K, Sterling M. Comparative effectiveness of physical exercise interventions for chronic non-specific neck pain: a systematic review with network meta-analysis of 40 randomised controlled trials. Br J Sports Med. 2020 Nov 2:bjsports-2020-102664. doi: 10.1136/bjsports-2020-102664. Online ahead of print.

  • Moher D, Hopewell S, Schulz KF, Montori V, Gotzsche PC, Devereaux PJ, Elbourne D, Egger M, Altman DG; CONSORT. CONSORT 2010 explanation and elaboration: updated guidelines for reporting parallel group randomised trials. Int J Surg. 2012;10(1):28-55. doi: 10.1016/j.ijsu.2011.10.001. Epub 2011 Oct 12.

  • Hou CR, Tsai LC, Cheng KF, Chung KC, Hong CZ. Immediate effects of various physical therapeutic modalities on cervical myofascial pain and trigger-point sensitivity. Arch Phys Med Rehabil. 2002 Oct;83(10):1406-14. doi: 10.1053/apmr.2002.34834.

  • Jull GA, O'Leary SP, Falla DL. Clinical assessment of the deep cervical flexor muscles: the craniocervical flexion test. J Manipulative Physiol Ther. 2008 Sep;31(7):525-33. doi: 10.1016/j.jmpt.2008.08.003.

  • Rodriguez-Sanz J, Malo-Urries M, Corral-de-Toro J, Lopez-de-Celis C, Lucha-Lopez MO, Tricas-Moreno JM, Lorente AI, Hidalgo-Garcia C. Does the Addition of Manual Therapy Approach to a Cervical Exercise Program Improve Clinical Outcomes for Patients with Chronic Neck Pain in Short- and Mid-Term? A Randomized Controlled Trial. Int J Environ Res Public Health. 2020 Sep 10;17(18):6601. doi: 10.3390/ijerph17186601.

  • Tsang SMH, So BCL, Lau RWL, Dai J, Szeto GPY. Effects of combining ergonomic interventions and motor control exercises on muscle activity and kinematics in people with work-related neck-shoulder pain. Eur J Appl Physiol. 2018 Apr;118(4):751-765. doi: 10.1007/s00421-018-3802-6. Epub 2018 Jan 15.

  • Beer A, Treleaven J, Jull G. Can a functional postural exercise improve performance in the cranio-cervical flexion test?--a preliminary study. Man Ther. 2012 Jun;17(3):219-24. doi: 10.1016/j.math.2011.12.005. Epub 2012 Feb 4.

  • Boonstra AM, Schiphorst Preuper HR, Balk GA, Stewart RE. Cut-off points for mild, moderate, and severe pain on the visual analogue scale for pain in patients with chronic musculoskeletal pain. Pain. 2014 Dec;155(12):2545-2550. doi: 10.1016/j.pain.2014.09.014. Epub 2014 Sep 17.

  • Park G, Kim CW, Park SB, Kim MJ, Jang SH. Reliability and usefulness of the pressure pain threshold measurement in patients with myofascial pain. Ann Rehabil Med. 2011 Jun;35(3):412-7. doi: 10.5535/arm.2011.35.3.412. Epub 2011 Jun 30.

  • Gonzalez T, Balsa A, Sainz de Murieta J, Zamorano E, Gonzalez I, Martin-Mola E. Spanish version of the Northwick Park Neck Pain Questionnaire: reliability and validity. Clin Exp Rheumatol. 2001 Jan-Feb;19(1):41-6.

  • Garcia Campayo J, Rodero B, Alda M, Sobradiel N, Montero J, Moreno S. [Validation of the Spanish version of the Pain Catastrophizing Scale in fibromyalgia]. Med Clin (Barc). 2008 Oct 18;131(13):487-92. doi: 10.1157/13127277. Spanish.

  • Gomez-Perez L, Lopez-Martinez AE, Ruiz-Parraga GT. Psychometric Properties of the Spanish Version of the Tampa Scale for Kinesiophobia (TSK). J Pain. 2011 Apr;12(4):425-35. doi: 10.1016/j.jpain.2010.08.004.

  • Vohralik SL, Bowen AR, Burns J, Hiller CE, Nightingale EJ. Reliability and validity of a smartphone app to measure joint range. Am J Phys Med Rehabil. 2015 Apr;94(4):325-30. doi: 10.1097/PHM.0000000000000221.

  • Melian-Ortiz A, Varillas-Delgado D, Laguarta-Val S, Rodriguez-Aparicio I, Senent-Sansegundo N, Fernandez-Garcia M, Roger-de Ona I. [Reliability and concurrent validity of the app Goniometer Pro vs Universal Goniometer in the determination of passive knee flexion]. Acta Ortop Mex. 2019 Jan-Feb;33(1):18-23. Spanish.

  • Ghorbani F, Kamyab M, Azadinia F. Smartphone Applications as a Suitable Alternative to CROM Device and Inclinometers in Assessing the Cervical Range of Motion in Patients With Nonspecific Neck Pain. J Chiropr Med. 2020 Mar;19(1):38-48. doi: 10.1016/j.jcm.2019.10.004. Epub 2020 Sep 3.

  • Pourahmadi MR, Bagheri R, Taghipour M, Takamjani IE, Sarrafzadeh J, Mohseni-Bandpei MA. A new iPhone application for measuring active craniocervical range of motion in patients with non-specific neck pain: a reliability and validity study. Spine J. 2018 Mar;18(3):447-457. doi: 10.1016/j.spinee.2017.08.229. Epub 2017 Sep 7.

MeSH Terms

Conditions

Myofascial Pain SyndromesFacial Pain

Interventions

AcupressureContinuous Positive Airway PressureExercise Therapy

Condition Hierarchy (Ancestors)

Muscular DiseasesMusculoskeletal DiseasesPainNeurologic ManifestationsSigns and SymptomsPathological Conditions, Signs and Symptoms

Intervention Hierarchy (Ancestors)

Therapy, Soft TissueMusculoskeletal ManipulationsComplementary TherapiesTherapeuticsPhysical Therapy ModalitiesRehabilitationPositive-Pressure RespirationRespiration, ArtificialAirway ManagementRespiratory TherapyAftercareContinuity of Patient CarePatient Care

Study Officials

  • Angela C Álvarez Melcón, Doctor

    Universidad Complutense de Madrid

    STUDY DIRECTOR
  • Isidro Fernández López, Doctor

    Universidad Complutense de Madrid

    STUDY DIRECTOR
  • María A Atín Arratibel, Doctor

    Universidad Complutense de Madrid

    STUDY DIRECTOR
  • Iván Batuecas Sánchez, PhD

    Universidad Complutense / Fisioterapia Los Molinos

    PRINCIPAL INVESTIGATOR

Central Study Contacts

Iván Batuecas Sánchez, PhD

CONTACT

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
DOUBLE
Who Masked
PARTICIPANT, OUTCOMES ASSESSOR
Masking Details
The selection of participants and the randomisation sequence will be carried out by the principal investigator using the patient's unique identity number in the centre's programme as a code. After randomisation, participants will be sent by another therapist in the centre to each intervention room without knowing which treatment they will receive. The therapists in charge of delivering the interventions will not know which patient has been assigned to them. Although both therapists and patients will not know which group they are assigned to, obviously the therapist, given the nature of the intervention and the need to know and master the technique, knows which treatment to apply to each subject.
Purpose
TREATMENT
Intervention Model
PARALLEL
Model Details: Randomised, controlled, clinical trial with blinded assessment of response variables. The guidelines of the CONSORT guide will be followed. A follow-up of the participants will be carried out, where measurements will be taken prior to the intervention (baseline), after the protocol of four treatment sessions and fifteen days after the last session.
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
PhD student, Principal investigator

Study Record Dates

First Submitted

September 14, 2023

First Posted

September 25, 2023

Study Start

September 25, 2023

Primary Completion

July 31, 2024

Study Completion

September 20, 2024

Last Updated

September 25, 2023

Record last verified: 2023-09

Data Sharing

IPD Sharing
Will share

The present study is carried out as a doctoral thesis of the principal investigator. Therefore, a scientific dissemination is foreseen in the Complutense University of Madrid as well as in the appropriate journals.

Shared Documents
STUDY PROTOCOL, SAP, ICF, CSR, ANALYTIC CODE
Time Frame
From July 2024 until the submission of the thesis
Access Criteria
Upon request to the principal investigator and his research team

Locations