Department of Medicine, King Saud University, Riyadh, Saudi Arabia. Obesity Research Center, King Saud University, Riyadh, Saudi Arabia. Department of Medicine, Endocrinology Division, Ministry of Health, Kuwait City, Kuwait. Faculty of Allied Health Sciences, Kuwait University, Kuwait City, Kuwait. Endocrine and Internal Medicine Department, Qassim University, Buraydah, Saudi Arabia. Obesity, Endocrine, and Metabolism Center, King Fahad Medical City, Riyadh, Saudi Arabia.