title: Vitamin D deficiency--the once and present epidemic.
authors.forename: James P
authors.initials: JP
authors.lastname: Richardson
mesh_terms: D004032:Diet; D006801:Humans; D006996:Hypocalcemia / Q000209:etiology; D010018:Osteomalacia / Q000209:etiology; D010146:Pain / Q000209:etiology; D013472:Sunlight; D014807:Vitamin D / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood; D014808:Vitamin D Deficiency / Q000150:complications* / Q000175:diagnosis / Q000517:prevention & control*
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D