1. Department of Internal Medicine 3; Friedrich-Alexander-University Erlangen-Nuremberg (FAU); Erlangen Germany
2. St. Vincent Hospital, Medical Department II, VINFORCE Study Group; Academic Teaching Hospital of Medical University of Vienna; Vienna Austria
3. Department of Trauma and Orthopaedic Surgery; University Hospital of Erlangen; Erlangen Germany
4. Bone Metabolism Laboratory; Rheumatology Division; Faculdade de Medicina da Universidade de São Paulo; São Paulo Brazil
5. Institute of Anatomy; Department I; Friedrich-Alexander-University of Erlangen-Nuremberg; Erlangen Germany
6. Institute of Medical Physics (IMP); University of Erlangen; Erlangen Germany