Effects of sex and age on bone microstructure at the ultradistal radius: a population-based nonin-vasive in vivo assessment - Khosla, S; Riggs, B L; Atkinson, E J; Oberg, A L; McDaniel, L J; Holets, M; Peterson, J M; Melton, L J, 3rd (J Bone Miner Res, 2006)