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- Western Michigan University School of Medicine
- Western New England Renal & Transplant Associates, PC
- Western Norway University of Applied Sciences
- Western Oregon University
- Western Orthopaedics Research and Education Foundation
- Western Pistachio Association
- Western Regional Medical Center
- Western Sky Medical Research
- Western States Endurance Run Research Foundation
- Western Sussex Hospitals NHS Trust
- Western Sydney Local Health District
- Western Trauma Association
- Western University
- Western University, Canada
- Western University of Health Sciences
- Western Vascular Institute, Ireland
- Western Washington University
- Westfälische Wilhelms-Universität Münster
- Westfries Hospital
- West German Center of Diabetes and Health
- West German Heart Center Essen
- West German Study Group
- West Hertfordshire Hospitals NHS Trust
- West Japan Thoracic Oncology Group
- West Kazakhstan Medical University
- Westlake University
- West London Mental Health NHS Trust
- Westminster College
- West of Scotland Lymphoma Group
- Weston Brain Institute
- Weston Park Hospital Cancer Charity
- West Park Healthcare Centre
- West Penn Allegheny Health System
- West Pomeranian Cancer Center
- West Side ENT
- Westside Family Medical Center, P.C.
- West Side Institute for Science and Education
- Westside Medical Associates of Los Angeles
- West University of Timisoara
- Westview Physician Collaborative
- West Virginia Clinical and Translational Science Institute
- West Virginia School of Osteopathic Medicine
- West Virginia University
- West Virginia University Healthcare
- We The Village, Inc.
- Wexham Park Hospital
- WFH MEDICAL, LLC
- Wheaton Franciscan Healthcare
- White Clover Research Foundation
- White Cross Nursing Home
- White Plains Hospital
- Whitten Laser Eye
- WHO Collaborating Centre for Maternal and Child Health, Trieste
- WHO, Department of Maternal, Newborn, Child and Adolescent Health
- Wholesome Wave
- Wichita Medical Research and Education Foundation
- Wiebe, Ellen, M.D.
- Wielkopolskie Centrum Pulmonologii i Torakochirurgii
- Wigmore Clinic
- Wihuri Research Institute
- WILD 5 Wellness
- Wilderman Medical Clinic
- Wilfrid Laurier University
- Wilhelminenspital Vienna
- Wilkes University
- William and Flora Hewlett Foundation
- William Beaumont Hospitals
- William Buckland Foundation
- William Carey University
- William E And Aenid R Weisgerber Foundation
- William Lawrence and Blanche Hughes Foundation
- William Marsh Rice University
- William Maykel, D.C., Wellness Medicine
- William Osler Health System
- William Paterson University of New Jersey
- William Penn Foundation
- Williams Center Plastic Surgery Specialists
- Williams College
- William T. Grant Foundation
- Willis-Knighton River Cities Clinical Research Center
- Wills Eye
- Winchester and Eastleigh Healthcare NHS Trust
- Winchester District Memorial Hospital
- Winchester Medical Center
- Windber Research Institute
- Windsor-Essex Compassionate Care Community
- Windsor Regional Hospital
- Windward Islands Research and Education Foundation
- Wingate Institute
- Wingate Institute of Neurogastroenterology
- Wings for Life
- Winners Clinic
- Winnipeg Regional Health Authority
- Winston Salem State University
- Winter Rose Services, LLC
- Winthrop University
- Winthrop University Hospital
- Wirral University Teaching Hospital NHS Trust
- Wisconsin Center for Advanced Research
- Wisconsin Partnership Program
- Wisconsin Research Network
- Wishard Health Services
- WiSP GmbH
- WiSP Wissenschaftlicher Service Pharma GmbH
- Wissenschaftliches Institut Bethanien e.V
- Wits Health Consortium (Pty) Ltd
- Wits Reproductive Health and HIV Institute
- W.K. Kellogg Foundation
- Wollo University
- Woman and Health Private Clinic Vienna
- Woman's
- Woman's Cancer Foundation
- Woman's Health University Hospital, Egypt
- Woman's Hospital, Louisiana
- Womb Transplant UK
- Women and Children Hospital of Qinghai Province
- Women and Children's Health Research Institute, Canada
- Women and Children's Hospital, Branch of Chongqing Sanxia Central Hospital
- Women and Children's Hospital of Linyi City
- Women and Infants Hospital of Rhode Island
- Women & Children's Hospital of Buffalo
- Women's Cancer Care Associates, LLC
- Womens Care
- Women's College Hospital
- Women's Health Care Clinic, Torrance, California
- Women's Health Research Institute of British Columbia
- Women's Health Services, Santa Fe, New Mexico
- Women's Hormone Network
- Women's Hospital HUS
- Women's Hospital School Of Medicine Zhejiang University
- Wonju Severance Christian Hospital
- Wonkwang University
- Wonkwang University Hospital
- Woodinville Psychiatric Associates
- Woolcock Institute of Medical Research
- Worcester Polytechnic Institute
- Worcestershire Acute Hospitals NHS Trust
- Workers' Compensation Board, Alberta
- World Anti-doping Agency
- World Bank
- World Cancer Research Fund International
- World Federation of Hemophilia
- WorldFish
- World Health Information Science Consultants, LLC
- World Health Organization
- World Heart Failure Society
- World Organization of Medical Synergetics
- World Society of Emergency Surgery
- World Vision
- World Vision Canada
- Worldwide Clinical Trials
- Worldwide Innovative Networking Association
- Wrightington, Wigan and Leigh NHS Foundation Trust
- Wright State Physicians
- Wright State University
- Wroclaw Medical University
- Wrocław University of Science and Technology
- Wuerzburg University Hospital
- Wuhan Asia Heart Hospital
- Wuhan Central Hospital
- Wuhan Children's Hospital
- Wuhan General Hospital of Guangzhou Military Command
- Wuhan Institute for Tuberculosis Control
- Wuhan Integrated Traditional Chinese and Western Medicine Hospital
- Wuhan Iron and Steel Workers' Hospital
- Wuhan Mental Health Centre
- Wuhan Neurophth Biotechnology Limited Company
- Wuhan No.1 Hospital
- Wuhan Pu-Ai Hospital
- Wuhan Third Hospital
- Wuhan TongJi Hospital
- Wuhan Union Hospital, China
- Wuhan University
- Wuhan Women and Children's Medical Center
- Wu Jieping Medical Foundation
- Wujin People's Hospital
- Wulumuqi General Hospital of Lanzhou Military Command
- Wuqu' Kawoq, Maya Health Alliance
- Wuxi Hospital for Infectious Diseases
- Wuxi No. 2 People's Hospital
- Wuxi No. 4 People's Hospital
- Wuxi People's Hospital
- Wuzhou Red Cross Hospital
- Wyckoff Heights Medical Center
- Wyndhurst Counseling Center
- Wyss Center for Bio and Neuroengineering
- Wyss Institute at Harvard University
- Wythenshawe Hospital
- Xavier Institute of Management, Bhubaneswar
- Xavier University of Louisiana.
- XenoTherapeutics, Inc.
- Xerencia de Xestión Integrada de Ferrol
- Xiamen Cardiovascular Hospital, Xiamen University
- Xiamen Children's Hospital
- Xiamen Children's Hospital, Fujian of China
- Xiamen Maternity & Child Care Hospital
- Xiamen University
- Xi'an Biocare Pharma Ltd.
- Xi'an Central Hospital
- Xiangtan Central Hospital