title: Analysis of 25-hydroxyvitamin D in plasma using solid phase extraction.
authors: MRC Metabolic Research Group, Tygerberg Hospital, South Africa.
authors: G S
authors: GS
authors: Shephard
authors: S M
authors: SM
authors: Carlini
authors: C
authors: C
authors: Hanekom
authors: D
authors: D
authors: Labadarios
mesh_terms: D002112:Calcifediol / Q000097:blood*; D006801:Humans; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002112:Calcifediol