[1] Shanghai Jiao Tong Univ, Dept Orthoped Surg, Sch Med, Shanghai 200030, Peoples R China
[2] Shanghai Jiao Tong Univ, Peoples Hosp 9, Sch Med, Biol Stat Dept, Shanghai 200030, Peoples R China
[3] Henry Ford Hosp, Bone & Mineral Res Lab, Detroit, MI 48202 USA