Wadhera, Nishant, Geetika Kalra, Abhishek Gupta, Saurabh Singhal, and S. K. Jha. “Study to Determine Serum Vitamin D Levels in Patients With Congestive Heart Failure”. International Journal of Research in Medical Sciences 7, no. 12 (November 27, 2019): 4762–4767. Accessed October 14, 2025. https://www.msjonline.org/index.php/ijrms/article/view/7260.