ANALYSIS OF LIFESTYLE, KNOWLEDGE, ATTITUDE, AND KNOWLEDGE OF WOMEN AGED 20-50 YEARS OLD WITH VITAMIN D DEFICIENCY-INSUFFICIENCY IN NORTH SUMATERA, INDONESIA. Sumat. Med. J. [Internet]. 2017 Aug. 10 [cited 2026 Feb. 4];1(01):1-7. Available from: https://idjpcr.usu.ac.id/smj/article/view/75