1Division of Orthopedic Rheumatology, Department of Orthopedic Surgery, University of Erlangen-Nuremberg, Rathsberger Str. 57, Erlangen, D-91054, Germany
2Department of Orthopedic Surgery and Trauma Surgery, Martha-Maria Hospital Nuremberg, Stadenstrasse 58, Nürnberg, 90491, Germany
3Department for Orthopaedics, Trauma Surgery and Hand Surgery, Klinikum Osnabrück, Am Finkenhügel 1, Osnabrück, 49076, Germany