[1] Erasmus Univ, Med Ctr, Bone Ctr, Dept Internal Med, Rotterdam, Netherlands
[2] Hosp Pedro Hispano, Matosinhos Local Hlth Unit, Dept Endocrinol, Matosinhos, Portugal
[3] Tech Univ Dresden, Med Ctr, Dept Med 3, Dresden, Germany
[4] Tech Univ Dresden, Med Ctr, Ctr Hlth Aging 4, Dresden, Germany
[5] Univ Libre Bruxelles ULB, CHU Brugmann, Dept Med, Brussels, Belgium
[6] Frankfurt Ctr Bone Hlth, Goethestr 23, Frankfurt, Germany
[7] Philipps Univ Marburg, Marburg, Germany