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- American Academy of Family Physicians
- American Academy of Neurology
- American Academy of Ophthalmology
- American Academy of Optometry
- American Academy of Orthopaedic Manual Physical Therapists
- American Academy of Osteopathy
- American Academy of Otolaryngology-Head and Neck Surgery Foundation
- American Academy of Pediatrics
- American Academy of Physical Medicine and Rehabilitation
- American Academy of Regenerative Medicine
- American Academy of Sleep Medicine
- American Access Care
- American Alliance for pProm Support
- American Association for Cancer Research
- American Association for Geriatric Psychiatry
- American Association for Respiratory Care
- American Association for the Study of Liver Diseases
- American Association for the Surgery of Trauma
- American Association of Chairs of Departments of Psychiatry
- American Association of Colleges of Pharmacy
- American Association of Diabetes Educators
- American Association of Endodontists
- American Association of Gynecologic Laparoscopists
- American Association of Homes and Services for the Aging
- American Association of Kidney Patients
- American Association of Neurological Surgeons
- American Beverage Association
- American Board of Internal Medicine
- American Board of Surgery
- American Brain Foundation
- American Brain Tumor Association
- American British Cowdray Medical Center
- American Burn Association
- American Cancer Society - Asian Initiatives
- American Cancer Society, Inc.
- American Cochlear Implant Alliance
- American College of Allergy, Asthma and Immunology
- American College of Cardiology
- American College of Chest Physicians
- American College of Clinical Pharmacy
- American College of Emergency Physicians
- American College of Foot and Ankle Surgeons
- American College of Gastroenterology
- American College of Medical Toxicology
- American College of Phlebology
- American College of Radiology
- American College of Rheumatology
- American College of Rheumatology Research and Education Foundation
- American College of Sports Medicine
- American College of Surgeons
- American Contact Dermatitis Society (ACDS)
- American Corneal Consultants
- American Council on Exercise
- American Dental Association
- American Diabetes Association
- American Egg Board
- American Epilepsy Society
- American Federation for Aging Research
- American Federation of Medical Synergetics
- American Fibromyalgia Syndrome Association
- American Foundation for Addiction Research
- American Foundation for Suicide Prevention
- American Gastroenterological Association
- American Gastroenterological Association Foundation
- American Glaucoma Society
- American Headache Society
- American Head and Neck Society
- American Health Assistance Foundation
- American Heart Association
- American Heart of Poland
- American Hip Institute
- American Hospital of Paris
- American Institute for Cancer Research
- American Institute for Voice and Ear Research
- American Institutes for Research
- American Joint Replacement Registry
- American Laryngological Association
- American Legion of Iowa Foundation
- American Lung Association
- American Lung Association Asthma Clinical Research Centers
- American Medical Academy, Serbia
- American Medical Association
- American Medical Association Foundation
- American Medical Center
- American Medical Women's Association
- American National Red Cross
- American Neurogastroenterology and Motility Society
- American Nurses Foundation
- American Occupational Therapy Foundation
- American Optometric Association
- American Orthopaedic Society for Sports Medicine
- American Orthotic and Prosthetic Association
- American Osteopathic Association
- American Pain Society
- American Parkinson's Disease Association, Inc
- American Pharmacists Association
- American Pharmacists Association Foundation
- American Physical Therapy Association
- American Pistachio Growers
- American Psychiatric Association
- American Psychological Association (APA)
- American Psychological Foundation
- American Pulse Association
- American Radiology Services, Inc
- American Rhinologic Society
- American Roentgen Ray Society
- American Scitech International
- American Shoulder and Elbow Surgeons
- American SIDS Institute
- American Skin Association
- American Society for Bariatric Surgery
- American Society for Colposcopy and Cervical Pathology
- American Society for Dermatologic Surgery
- American Society for Gastrointestinal Endoscopy
- American Society for Laser Surgery and Medicine
- American Society for Metabolic and Bariatric Surgery
- American Society for Nutrition
- American Society for Parenteral and Enteral Nutrition
- American Society for Surgery of the Hand
- American Society of Anesthesiologists
- American Society of Bariatric Physicians
- American Society of Clinical Oncology
- American Society of Colon and Rectal Surgeons
- American Society of Health-System Pharmacists
- American Society of Health-System Pharmacists Research and Education Foundation
- American Society of Hematology
- American Society of Nephrology
- American Society of Pediatric Otolaryngology
- American Society of Regional Anesthesia
- American Society Of Thermalism And Climatology Inc
- American Society of Transplant Surgeons
- American Stem Cell, Inc.
- American Thoracic Society
- American Tinnitus Association
- American University
- American University of Armenia
- American University of Armenia Fund
- American University of Beirut Medical Center
- American University of Sharfah
- American Urogynecologic Society
- American Urological Association
- American Venous Forum
- Americares
- America's Essential Hospitals
- amfAR, The Foundation for AIDS Research
- Amiens University Hospital
- Aminu Kano Teaching Hospital
- Amita Health
- Amit, Patel N, M.D.
- AmniSure International LLC
- Amnitrans Eyebank Rotterdam
- Amparo Maternal Maternidade Social
- Amphia Hospital
- Amputee Coalition of America
- Amref Health Africa
- Amrita Institute of Medical Sciences & Research Center
- Amrita Vishwa Vidyapeetham
- AMS Centro Medico del Ejercicio
- Amshaj IVF Center
- Amsterdam Institute for Global Health and Development
- Amsterdam UMC, location AMC
- Amsterdam UMC, location VUmc
- Amyloidosis Foundation
- Amyloidosis Research Consortium
- Amyloidosis Support Groups
- Anadolu Medical Center
- Anahuac University
- Analog Device, Inc.
- Analysis and Research Network, S.L
- Analyst Research Laboratories
- Anbiome Labs LLC
- Anchora Medical
- Anchor Trust
- Andalas University
- Andalusian Initiative for Advanced Therapies - Fundación Pública Andaluza Progreso y Salud
- Andalusian Network for Design and Translation of Advanced Therapies
- Anderson Orthopaedic Research Institute
- Andrews Research & Education Foundation
- Andrews University
- Androcenter, Napoli, Italy
- ANDROFERT - Clinica de Andrologia e Reproducao Humana
- Andrology and Fertility Hospital of Hanoi
- Andros Day Surgery Clinic
- Andrzej Frycz Modrzewski Krakow University
- Anemia Institute for Research & Education
- Anemia Working Group Romania
- AnestesiaR
- Anestesiavdelingen Baerum Sykehus
- Anesthesia Patient Safety Foundation
- Anesthesia Quality Institute
- Anesthesiology WSU/DMC-NorthStar
- Aneurin Bevan University Health Board
- Angelholm Hospital
- Angelman Syndrome Foundation, Inc.
- Angkor Hospital for Children
- Anglia Ruskin University
- Anglo Celtic Cooperative Oncology Group
- Anglo-European College of Chiropractic
- Ang Mo Kio - Thye Hua Kwan Hospital
- Anhembi Morumbi University