1 Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Berlin, Germany.
2 Department of Orthopaedics and Orthopaedic Surgery, University Medicine Greifswald, Greifswald, Germany.
3 Institute of Pathology, Ludwig Maximilian University of Munich, Munich, Germany.
4 Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Berlin, Germany; Department of Orthopaedics and Orthopaedic Surgery, University Medicine Greifswald, Greifswald, Germany. Electronic address: anastasia.rakow@med.uni-greifswald.de.