Zaman, M. S.; Rahman, M. M.; Biswas, S. K.; Hoque, M. M.; Nahid, K. A. Association of Serum Vitamin D and Parathormone Levels in Patients of Type 2 Diabetes Mellitus With Diabetic Retinopathy. Bangabandhu Sheikh Mujib Medical University Journal 2017, 10, 61-65.