[1] Free Univ Berlin, Charite Campus Benjamin Franklin, Ctr Muscle & Bone Res, D-1000 Berlin, Germany
[2] Humboldt Univ, Charite Campus Benjamin Franklin, Ctr Muscle & Bone Res, D-1086 Berlin, Germany
[3] Osteoporosis Study Soc, Frankfurt, Germany
[4] Kuratorium Knochengesundheit eV, Sinsheim, Germany
[5] Immanuel Krankenhaus, Berlin, Germany