title: Puzzling vitamin D results.
authors.forename: Trevor G
authors.initials: TG
authors.lastname: Marshall
mesh_terms: D000416:Alberta / Q000453:epidemiology; D002112:Calcifediol / Q000097:blood; D002117:Calcitriol / Q000097:blood; D003718:Denmark / Q000453:epidemiology; D006801:Humans; D012621:Seasons; D014808:Vitamin D Deficiency / Q000175:diagnosis* / Q000453:epidemiology
chemical_list: D002117:Calcitriol; D002112:Calcifediol