Handoko, H., Purwanti, A., Tanjungsari, D. W., Pertiwi, I., & Murtiani, F. (2022). Hubungan Antara Kadar Vitamin D dengan Derajat Keparahan COVID-19. The Indonesian Journal of Infectious Diseases, 8(1), 1–9. https://doi.org/10.32667/ijid.v8i1.130