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WebMD LLC, New York, USA
PubMed Central, National Library of Medicine, Bethesda, MD, USA
Chêne-Bourg, Switzerland
University of Iowa
Department of Family and Social Medicine, Albert Einstein College of Medicine, NY, USA
MedicineNet, WebMD LLC, New York, USA
MediLexicon, International Ltd., Brighton, UK
Emedicine.medscape, WebMD LLC, New York, USA
U.S: National Library of Medicine, Bethesda, MD, USA
Doctor's Guide Publishing Limited
Edusan, Bratislava, Slovakia, in Slovak