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- Cancer Research Antwerp
- Cancer Research Campaign Clinical Trials Centre
- Cancer Research Center of Marseille
- Cancer Research Centre at Weston Park Hospital
- Cancer Research Foundation of America
- Cancer Research Group - Collaborative Group, Beirut, Lebanon.
- Cancer Research Institute, New York City
- Cancer Research Institute of Contra Costa
- Cancer Research Malaysia
- Cancer Research Network
- Cancer Research UK
- Cancer Research UK Cambridge Institute
- Cancer Research UK, Glasgow
- Cancer Research UK & UCL Cancer Trials Centre
- Cancer Society Auckland
- Cancer Support Community, Research and Training Institute, Philadelphia
- Cancer Therapeutics Research Group
- Cancer Therapy and Research Center, Texas
- Cancer Treatment Centers of America
- Cancer Treatment Research Foundation
- Cancer Trials Australia
- Cancer Trials New Zealand
- Candiolo Cancer Institute - IRCCS
- CANDLE-KIT Trial Study Group
- Cangzhou Central Hospital
- Cangzhou Hospital of Integrated Traditional Chinese and Western Medicine
- Cangzhou People's Hospital
- Canisius College
- Canisius-Wilhelmina Hospital
- Çankırı Karatekin University
- Cannabis Research Associates
- Canola Council of Canada
- Cantabria Health Service
- Canterbury Christ Church University
- Can Tho Stroke International Services Hospital
- Can Tho University
- Cantonal Hospital Dr. Safet Mujic Mostar
- Cantonal Hospital, Frauenfeld
- Cantonal Hospital of Aarau, Switzerland
- Cantonal Hospital of St. Gallen
- Cantonal Hospital Schaffhausen
- Cantonal Hospital Zenica
- Cantonal Hosptal, Baselland
- Canyon City Eyecare
- Capacity Builders Inc.
- Cape Cod Hospital
- Capio Group
- Capio Research Foundation
- Capio Sankt Görans Hospital
- Capital Clinical Research Associates, LLC
- Capital Digestive Care, LLC
- Capital Health, Canada
- Capital Health System, Inc
- Capital Hospital, Bhubaneswar
- Capital Institute of Pediatrics, China
- Capital Medical University
- Capital Vision Research Trust
- CAPNETZ Stiftung
- Caps Research Network
- Cardarelli Hospital
- Cardenal Herrera University
- CardiaBase
- Cardiac Arrhythmia Network of Canada
- Cardiac Centre, Pamplemousses
- Cardiac Imaging of Augusta
- Cardiac Research Institute BV
- Cardiac Risk in the Young
- Cardiff Metropolitan University
- Cardiff University
- Cardinal Stefan Wyszynski University
- Cardinal Tien Hospital
- Cardioangiologisches Centrum Bethanien
- Cardiocentro Ticino
- Cardiochirurgia E.H.
- Cardiologie et Développement
- Cardiology Center Agel
- Cardiology Clinical Research & Regulatory Group
- Cardiology Office, Rheinfelden, Switzerland
- Cardiology Research UBC
- Cardiopulmonary Research Science and Technology Institute
- Cardiovascular Academy Society, Turkey
- Cardiovascular and Interventional Radiological Society of Europe
- Cardiovascular and Pulmonary Rehabilitation Center of Saint Orens
- Cardiovascular Associates of the Delaware Valley
- Cardiovascular Center Frankfurt
- Cardiovascular Clinical Science Foundation
- Cardiovascular Clinical Studies
- Cardiovascular Consultants of Nevada
- Cardiovascular Innovation and Research Institute
- Cardiovascular Institute of the South Clinical Research Corporation
- Cardiovascular Research Center, Brazil
- CardioVascular Research Foundation, Korea
- Cardiovascular Research Foundation, New York
- Cardiovascular Research Institute Dublin
- Cardiovascular Research New Brunswick
- Cardiovascular Research Society, Greece
- Cardno ChemRisk
- Cardresearch
- CareerPoint Marin
- CARE Fertility UK
- CareFlight
- Careggi Hospital
- Care Management Plus
- CareMore Health, San Bernardino
- Care Partners
- Care Plus NJ, Inc.
- CareQuest Institute for Oral Health
- Cares, Kristen, M.D.
- Care South, Inc.
- Carezzo B.V.
- Caribbean Health Research Council
- Carilion Clinic
- Caring for Carcinoid Foundation
- Caritas Freetown
- Caritas Institute of Higher Education
- Caritasklinik St. Theresia
- Caritas-Krankenhaus Bad Mergentheim
- Caritas Medical Centre, Hong Kong
- Carle Foundation Hospital
- Carlo Besta Neurological Institute
- Carmel Medical Center
- Carnegie Mellon University
- Carol Davila University of Medicine and Pharmacy
- Carolina Eyecare Physicians, LLC
- Carolina Musculoskeletal Institute
- Carolina Neurosurgery & Spine Associates
- Carolina Research Professionals, LLC
- Carolinas Center for Advanced Management of Pain
- Carolinas Medical Center
- Carolina Urologic Research Center
- Caroline Medical Group
- Carol M. Baldwin Breast Cancer Research Fund, Inc.
- Carones Ophthalmology Center
- Carr, Brian
- Carrick Institute for Graduate Studies
- Carrier Clinic
- Carroll University
- Carruthers Dermatology Centre
- Casa Colina Hospital and Centers for Healthcare
- Casa de Saúde santa Marcelina
- Casa de Saúde São José
- Casa di Cura Dott. Pederzoli
- Casa di Cura Privata del Policlinico SpA
- Casa Di Cura Villa Serena SpA
- Casa Espirita Terra de Ismael
- Casa Sollievo della Sofferenza IRCCS
- Cascade Pharmaceuticals, Inc
- Case Comprehensive Cancer Center
- Case Western Reserve University
- Castilla-La Mancha Health Service
- Castilla-León Health Service
- Castleman Disease Collaborative Network
- Castleton University
- Catalan Society of Family Medicine
- Catcronic Salut SL
- Catharina Ziekenhuis Eindhoven
- Cathay General Hospital
- Catholic Health Care Services
- Catholic Health East
- Catholic Health Initiatives
- Catholic Home Care
- Catholic Kwandong University
- Catholic Medical Center
- Catholic Relief Services
- Catholic University, Italy
- Catholic University of Brasília
- Catholic University of Eichstätt-Ingolstadt
- Catholic University of Health and Allied Sciences
- Catholic University of Korea Saint Paul's Hospital
- Catholic University of Mozambique
- Catholic University of Murcia
- Catholic University of Pelotas
- Catholic University of Salta
- Catholic University of the Sacred Heart
- Catholic University of Valencia
- CB2 Insights
- CB Boers ORG
- CBCC-VIBGYOR Research Pvt. Ltd.
- CBmed Ges.m.b.H.
- CBR Systems, Inc.
- CCRF Consulting Co., Ltd.
- CDC Foundation
- CD Pharma Group S.r.l.
- CEBIS International
- Cedar Associates LLC
- Cedars-Sinai Medical Center
- Cedar, United Kingdom
- Cedarville University
- CEDIARA - Assoc. Solidariedade Social de Ribeira de Fráguas
- Ced Service GmbH
- Celal Bayar University
- Cellavita Pesquisa Científica Ltda
- Cellnovo Limited
- Cell Pharma
- CellPrint Biotechnology
- Cell Therapy Catapult
- Celso Arango, MD, PhD
- Celtaxsys, Inc.
- Cemit Center of Excellence in Medicine and IT
- Cemka-Eval