title: Serum 25-hydroxyvitamin D and parathyroid hormone exhibit threshold behavior.
authors.affiliation: Creighton University, Omaha, Nebraska 68131, USA. rheaney@creighton.edu
authors.forename: R P
authors.initials: RP
authors.lastname: Heaney
mesh_terms: D004056:Differential Threshold; D006801:Humans; D010281:Parathyroid Hormone / Q000097:blood*; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; C104450:25-hydroxyvitamin D