Niranjan, Gopal Evaluation of Circulating Plasma VEGF-A, ET-1 and Magnesium Levels as the Predictive Markers for Proliferative Diabetic Retinopathy. [electronic resource] - Indian journal of clinical biochemistry : IJCB Jul 2019 - 352-356 p. digital Publication Type: Journal Article ISSN: 0970-1915 Standard No.: 10.1007/s12291-018-0753-y doi