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- Associazione Medici Endocrinologi
- Associazione Nazionale Medici Cardiologi Ospedalieri
- Associazione Oncologia Traslazionale
- Associazione Portatori Dispositivi Impiantabili Cardiaci
- Associazione Progetto Oncologia UMAN.A
- Associazione Qol-one
- Associazione Riabilitatori Insufficienza Respiratoria
- Associazione Salentina Angela Serra
- Associazione Volontari Pazienti Oncologici
- ASST Bergamo Ovest
- ASST Fatebenefratelli Sacco
- ASST Gaetano Pini-CTO
- ASST Grande Ospedale Metropolitano Niguarda
- ASST Rhodense
- ASST Santi Paolo e Carlo
- AssureRx Canada Ltd
- Assuta Ashdod Hospital
- Assuta Hospital Systems
- Assuta Medical Center
- Astana Medical University
- A*Star
- A Step Ahead Foundation
- Astes
- Asthma and Allergic Diseases Cooperative Research Centers
- Asthma Inc Clinical Research Center
- Asthma UK
- Aston University
- Astoria Pain Management
- Astrakhan State Medical University
- Astra Zeneca, Bristol-Myers Squibb
- Astrid Lindgren Children´s Hospital
- Aswan University
- Aswan University Hospital
- Atatürk Chest Diseases and Chest Surgery Training and Research Hospital
- Ataturk Training and Research Hospital
- Ataturk University
- Ataulpho de Paiva Foundation
- Ataxia Study Group
- Ateneo de Manila University
- Ateneo de Zamboanga University
- Athabasca University
- Athena Institute, Netherlands
- Athens General Children's Hospital "Pan. & Aglaia Kyriakou"
- Athens Medical Center
- Athens Medical Society
- Athens Orthopedic Clinic, P.A.
- Athens Vision Eye Institute
- Athinaiki General Clinic
- Athletico Physical Therapy
- Atılım University
- Atlanta Clinical and Translational Science Institute
- Atlanta Colon & Rectal Surgery, Atlanta, GA
- Atlanta Diabetes Associates
- Atlanta Gastroenterology Associates
- Atlanta Heart Specialists, LLC
- Atlanta Medical Center
- Atlanta Vascular Research Foundation
- Atlant Clinical Ltd.
- AtlantiCare Regional Medical Center
- Atlantic Center for Oral and Maxillofacial Surgery
- Atlantic Health Sciences Corporation
- Atlantic Health System
- Atlantic Research Group
- Atlantic Therapeutics
- Atlantic University
- Atlantis Medical University College
- Atlas University
- Atopic Dermatitis Research Network
- Atrial Fibrillation Network
- Atrium Health
- Atrium Medical Center
- Atrius Health
- ATS Clinical Research
- A.T. Still University of Health Sciences
- Attikon Hospital
- Attorney General Consumer & Prescriber Education Grant
- Attune Medical
- Auburn University
- Auckland Medical Research Foundation
- Auckland University of Technology
- Audition Conseil à Nîmes
- Audition Conseil Perpignan
- Auerbach Hematology Oncology Associates P C
- Augenabteilung Allgemeines Krankenhaus Linz
- Augenarztpraxis Breisach
- Augenheilkunde Lindenthal
- Augmented eXperience E-health Laboratory
- Augusta Hospital, Berlin
- Augusta Hospital Duesseldorf
- Augusta University
- Augustinus Fonden
- August Pi Sunyer Biomedical Research Institute
- Aula Dental Avanzada
- Aultman Health Foundation
- Aurametrix
- AURA Paris
- AURA Sante
- AurKa Pharma Inc.
- Aurolab
- Aurora BayCare Medical Center
- Aurora Health Care
- Aurum Institute
- AUSL Romagna Rimini
- Austin Eye
- Austin Hospital, Melbourne Australia
- Austin Neuromuscular Center
- Austin Speech Labs
- Australasian College for Emergency Medicine
- Australasian Gastro Intestinal Research Foundation
- Australasian Leukaemia and Lymphoma Group
- Australasian Lung Cancer Trials Group
- Australasian Radiation Oncology Lymphoma Group
- Australasian Sarcoma Study Group
- Australasian Society for Infectious Diseases
- Australia and New Zealand Intensive Care Society
- Australian and New Zealand Children's Oncology Group
- Australian and New Zealand College of Anaesthetists
- Australian and New Zealand Intensive Care Research Centre
- Australian and New Zealand Society of Palliative Medicine
- Australian and New Zealand Urogenital and Prostate Cancer Trials Group
- Australian Catholic University
- Australian College of Critical Care Nurses
- Australian Concept Medical Center
- Australia New Zealand Gynaecological Oncology Group
- Australian Institute of Sport
- Australian Institute of Tropical Health and Medicine
- Australian National University
- Australian & New Zealand Children's Haematology/Oncology Group
- Australian Physiotherapy Research Foundation
- Australian Red Cross
- Australian Respiratory and Sleep Medicine Institute
- Australian Wine Research Institute
- Austral University, Argentina
- Austrian Academic Institute for Clinical Nutrition
- Austrian Breast Cancer Study Group
- Austrian Forum Against Cancer
- Austrian Hernia Study Group
- Austrian Research Group for Regenerative and Orthopedic Medicine
- Austrian Science Fund (FWF)
- Austrian Society for Clinical Nutrition
- Austrian Society of Periodontology
- Austrian Society Of Surgical Oncology
- Austrian Urogynecology Working Group (AUWG)
- Autism Science Foundation
- Autism Speaks
- Auto Dealers Caring for Kids Foundation
- Autoimmunity Centers of Excellence
- Autonomous Non-Profit Organization National Society of Onco-Pulmonologists
- Autonomous University of Morelos
- AUVA
- AUVA Trauma Center Meidling
- Auxilio Mutuo Cancer Center
- Auxilium Vitae Volterra
- Avanos Medical
- Avanti Anesthesia
- Avedis Donabedian Research Institute
- Aveiro-Aradas Family Health Unit
- Aveiro University
- Aveni Foundation
- Aventura Hospital and Medical Center
- Avera McKennan Hospital & University Health Center
- Avera Sacred Heart Hospital
- Aversi Clinic
- Avicenna Military Hospital
- Avicenna Nutraceutical
- Avicenna Research Institute
- Avinashilingam Deemed University
- Avon Foundation
- Avon Partnership NHS
- Avrasya University
- Axio Biosolutions Pvt. Ltd.
- Axis Clinical Trials
- Aydin Adnan Menderes University
- Ayogo Health Inc.
- Ayse Cigdem Tutuncu
- Ayub Medical College, Abbottabad
- Ayub Teaching Hospital
- Ayudas Diagnosticas Sura S.A.S
- Azad University of Medical Sciences
- AZ Delta
- Azerbaijan Gastroenterology and Hepatology Association
- Azidus Brasil Scientific Research and Development Ltda
- Azienda di Servizi alla Persona di Pavia
- Azienda L'ULSS 15 Alta Padovana
- Azienda Ospedaliera
- Azienda Ospedaliera Bianchi-Melacrino-Morelli
- Azienda Ospedaliera Bolognini di Seriate Bergamo
- Azienda Ospedaliera Brotzu
- Azienda Ospedaliera Cardinale G. Panico
- Azienda Ospedaliera Città della Salute e della Scienza di Torino
- Azienda Ospedaliera Cosenza
- Azienda Ospedaliera dei Colli
- Azienda Ospedaliera di Bolzano
- Azienda Ospedaliera di Lecco
- Azienda Ospedaliera di Padova
- Azienda Ospedaliera di Perugia
- Azienda Ospedaliera Fatebenefratelli e Oftalmico
- Azienda Ospedaliera Niguarda Cà Granda
- Azienda Ospedaliera OO.RR. S. Giovanni di Dio e Ruggi D'Aragona
- Azienda Ospedaliera Ordine Mauriziano di Torino