1. Obesity Research Center, College of Medicine, King Saud University, P.O. Box 2925, Riyadh 11461, Saudi Arabia
2. Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia
3. Stem Cell Unit, Department of Anatomy, College of Medicine, King Saud University, P.O. Box 2925, Riyadh 11461, Saudi Arabia
4. Department of Medicine, College of Medicine, King Saud University, P.O. Box 2925, Riyadh 11461, Saudi Arabia