TAHIR, A.M. “Peran Polimorfisme Gen Collagen Type 1 Alpha 1 (COL1α1) Terhadap Penurunan Densitas Mineral Tulang Vertebra Lumbal Akseptor KB Suntik DMPA”. Indonesian Journal of Obstetrics and Gynecology 33, no. 3 (December 16, 2016). Accessed March 4, 2026. https://inajog.com/index.php/journal/article/view/200.