1. University Diabetes Center; College of Medicine; King Saud University; Riyadh Saudi Arabia
2. Department of Ophthalmology; College of Medicine; King Saud University; Riyadh Saudi Arabia
3. Registry Department; University Diabetes Center; King Saud University; Riyadh Saudi Arabia
4. Department of Biostatistics, Epidemiology and Scientific Computing; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
5. Biostatistics Department; University Diabetes Center; King Saud University; Riyadh Saudi Arabia
6. Clinical Department; University Diabetes Center; King Saud University; Riyadh Saudi Arabia