T. Ghaffar, Z. I. Marwat, F. Ullah, S. Khan, and A. ul H. Aamir, “ASSOCIATION OF SERUM TOTAL BILIRUBIN LEVEL WITH DIABETIC RETINOPATHY IN TYPE 2 DIABETES MELLITUS”, J Ayub Med Coll Abbottabad, vol. 28, no. 3, pp. 537–541, Aug. 2016.