Avinash Tiwari, Amit Kamleshbhai Mistry, and Shaktisinh R Zala. “Correlation of Vitamin D Levels With Left Ventricular Ejection Fraction in Patients With Dilated Cardiomyopathy”. GAIMS Journal of Medical Sciences, vol. 1, no. 1 (December), Oct. 2021, pp. 15-17, http://gjms.gaims.ac.in/ojs/index.php/gjms/article/view/29.