title: Steps forward in assessing populations.
authors.forename: Suzanne P
authors.initials: SP
authors.lastname: Murphy
authors.forename: Susan I
authors.initials: SI
authors.lastname: Barr
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009752:Nutritional Status; D011336:Probability; D014807:Vitamin D / Q000008:administration & dosage*; D014808:Vitamin D Deficiency / Q000453:epidemiology*
chemical_list: D014807:Vitamin D