title: An in vivo measurement of absolute bone density.
mesh_terms: D015502:Absorptiometry, Photon / Q000295:instrumentation; D001344:Autopsy; D001842:Bone and Bones / Q000000981:diagnostic imaging*; D005069:Evaluation Studies as Topic; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging