1. Department for General, Trauma and Reconstructive Surgery, Ludwig Maximilian University Munich, Marchioninistrasse 15, 81377 Munich, Germany
2. Department for Trauma Surgery and Sports Medicine, Medical University of Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria
3. Department of Orthopaedics and Traumatology, Tan Tock Seng Hospital, Singapore 308433
4. Paracelsus Medical Private University, Klinikum Nürnberg, Medizinische Klinik 2, Geriatrics, Prof.-Ernst-Nathan-Straße 1, 90419 Nürnberg, Germany