1. Department of Medicine, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
2. Department of Dentistry, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
3. Medical Research Center, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
4. Research Department, Weill Cornell Medicine-Qatar, P.O. Box 24144, Doha, Qatar