C. C. . Cabrera, O. A. Dampil, and A. M. Ong-Lopez, “The Association between Maternal Serum Vitamin D Levels and Gestational Diabetes Mellitus among Filipino Patients: A Cross-Sectional Study”, J ASEAN Fed Endocr Soc, vol. 35, no. 2, pp. 169–175, Aug. 2020.