Sudarma, Verawati, and Lukman Halim. “High Skeletal Muscle Mass Is Associated With Increased Serum 25(OH)D Levels in Elderly”. Universa Medicina 36, no. 3 (December 14, 2017): 236–242. Accessed April 28, 2024. https://univmed.org/ejurnal/index.php/medicina/article/view/485.