[1] Hanusch Hosp WGKK, Ludwig Boltzmann Inst Osteol, Vienna, Austria
[2] Hanusch Hosp, Dept Med 4, AUVA Trauma Ctr Meidling, Vienna, Austria
[3] Med Univ Vienna, Vienna Gen Hosp, Dept Orthopaed Surg, Vienna, Austria
[4] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA
[5] Harvard Univ, Sch Med, Dept Orthopaed Surg, Lab Study Skeletal Disorders & Rehabil, Boston, MA USA
[6] Childrens Hosp, Boston, MA 02115 USA