title: Etiology of nutritional rickets: geographic variations.
authors.forename: A R
authors.initials: AR
authors.lastname: Walker
mesh_terms: D002136:Calcium, Dietary / Q000008:administration & dosage*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D009549:Nigeria / Q000453:epidemiology; D012279:Rickets / Q000453:epidemiology / Q000209:etiology*; D013019:South Africa / Q000453:epidemiology; D014808:Vitamin D Deficiency / Q000150:complications* / Q000453:epidemiology
chemical_list: D002136:Calcium, Dietary