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Ensrud KE, Ewing SK, Taylor BC, Fink HA, Stone KL, Cauley JA, Tracy JK, Hochberg MC, Rodondi N, Cawthon PM; Study of Osteoporotic Fractures Research Group.Ensrud KE, et al.J Gerontol A Biol Sci Med Sci. 2007 Jul;62(7):744-51. doi: 10.1093/gerona/62.7.744.J Gerontol A Biol Sci Med Sci. 2007.PMID: 17634322