Firdaus EA, Wirjatmadi B. THE RELATIONSHIP OF KNOWLEDGE, EXPOSURE TO SUNLIGHT, AND CALCIUM INTAKE WITH THE RISK OF OSTEOPOROSIS. ijph [Internet]. 2020 Nov. 20 [cited 2024 Aug. 2];15(3):252-7. Available from: https://e-journal.unair.ac.id/IJPH/article/view/4444