1. Obesity Research Center, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
2. Department of Medicine, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
3. Clinical Chemistry Unit, Department of Pathology, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
4. Division of Endocrinology, Diabetes & Metabolism, Department of Medicine, School of Medicine, Anschutz Medical Campus, University of Colorado Denver, Aurora, CO 80045, USA
5. Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
6. Department of Surgery, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
7. Arthritis Research Group, Queen's University of Belfast, Centre for Infection and Immunity, Health Sciences Building, Belfast BT9 7BL, Northern Ireland