Measuring what isn't there.
Heaney
Robert P
RP
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
D002132:Calcium Radioisotopes; D002118:Calcium