title: Measuring what isn't there.
authors.forename: Robert P
authors.initials: RP
authors.lastname: Heaney
mesh_terms: D001862:Bone Resorption / Q000175:diagnosis*; D001842:Bone and Bones / Q000737:chemistry*; D002118:Calcium / Q000032:analysis*; D002132:Calcium Radioisotopes; D045604:Extracellular Fluid / Q000737:chemistry; D006801:Humans
chemical_list: D002132:Calcium Radioisotopes; D002118:Calcium