Kumar, S., and P. Saxena. “To Evaluate the Role of Plasma Vitamin D Level As a Prognostic Marker and Its Relation to in-Hospital Complications in Patients With Acute Coronary Syndrome”. International Journal of Advances in Medicine, vol. 3, no. 4, Dec. 2016, pp. 976-81, doi:10.18203/2349-3933.ijam20163734.