1. Obesity Research Center, College of Medicine, King Saud University, P.O. Box 2925 (98), Riyadh 11461, Saudi Arabia
2. Department of Medicine, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
3. Center of Excellence in Biotechnology Research, King Saud University, Riyadh 11461, Saudi Arabia
4. Clinical Chemistry Unit, Department of Pathology, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia