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Vitamin D deficiency and its associated factors in active TB patients at a tertiary hospital and three primary health care level facilities in Lusaka, Zambia: A cross sectional analytical study. mjz [Internet]. 2024 Jan. 3 [cited 2024 Nov. 21];50(2):132-41. Available from: https://mjz.co.zm/index.php/mjz/article/view/347