Prevalence of vitamin D deficiency in Africa: a systematic review and meta-analysis by Reagan M Mogire, MSc, Agnes Mutua, BSc, Wandia Kimita, MSc, Alice Kamau, MSc, Philip Bejon, PhD, John M Pettifor, MBBCh, Adebowale Adeyemo, MD, Thomas N Williams, FMedSci, Sarah H Atkinson, PhD

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