Free testosterone is an independent predictor of BMD and prevalent fractures in elderly men: MrOS Sweden. - Mellstrom,D.; Johnell,O.; Ljunggren,O.; Eriksson,AL.; Lorentzon,M.; Mallmin,H.; Holmberg,A.; Redlund-Johnell,I.; Orwoll,E.; Ohlsson,C. (J Bone Miner Res, 2006)