1. Center for Histopathology and Molecular Pathology, Trier, Germany;
2. Department of Dermatology and Allergologie, Ludwig-Maximilians-University (LMU), Munich, Germany;
3. Department of Orthopaedic Surgery, Friedrich-Alexander-University of Erlangen-Nuremberg, Germany;
4. Clinic of Orthopaedic Medicine and Emergency Surgery, Klinikum Mittelbaden Baden-Baden Balg, Baden-Baden, Germany;
5. Department of Orthopaedics and Traumatology, Johannes Gutenberg University, Mainz, Germany;
6. Paracelsus-Kliniken Deutschland GmbH, Osnabrück, Germany;
7. University Hospital for Trauma Surgery and Sports Traumatology, Salzburg, Austria.