Keumala, D.; Zulkarnaini Tala, Z.; Lestari, S.; Hutagalung, S. V.; Ganie, R. A.; Harum, D. S. 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. 2017, 1, 1-7.