1. Institute for Population Health, Weill Cornell Medicine-Qatar, Education City, Qatar Foundation, P.O. Box 24144, Doha, Qatar
2. Division of Epidemiology and Biostatistics, European Institute of Oncology, Milan, Italy
3. Department of Internal Medicine, Hamad Medical Corporation, Doha, Qatar
4. Department of Surgery and Department of Family Medicine, New York Medical College, Valhalla, NY, USA