1. Division of Orthopaedics, Department of Trauma and Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Germany.
2. Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Göttingen, Germany.
3. Department of Medical Biometry and Epidemiology and Institute for Health Services Research in Dermatology and Nursing (IVDP), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4. Kogod Center on Aging and Division of Endocrinology, Mayo Clinic, Rochester, Minnesota, USA.
5. Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
6. Department of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.