Siregar, Andi Putra, Rukiah Chodilawati, and Mgs. Irsan Saleh. “The Effect of Giving Vitamin D Supplements on Improving Ejection Fraction in Heart Failure Patients at Dr. Mohammad Hoesin General Hospital, Palembang, Indonesia”. Bioscientia Medicina : Journal of Biomedicine and Translational Research 7, no. 10 (September 28, 2023): 3628-3636. Accessed April 24, 2025. https://bioscmed.com/index.php/bsm/article/view/869.