A Community-Based Randomized Controlled Trial on Weekly Vitamin D₃ Supplementation for Prevention of Seasonal Respiratory Illness in Transit Workers. LMJHCR [Internet]. 2025 Dec. 31 [cited 2026 Apr. 29];3(2):1-8. Available from: https://linkmjhcr.com/index.php/lmj/article/view/116