Affiliation: | 1. Department of Orthopedic Surgery, Hamad General Hospital, Weill Cornell Medical College in Qatar, P.O. Box 3050, Doha, Qatar 2. Division of Population Health Sciences and Education, University of London, London, UK 3. Mayo Medical Library, Mayo Clinic, Rochester, USA 4. Department of Medicine, King Fahad Medical City, Riyadh, Saudi Arabia
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