1. Department of Orthopaedic and Trauma Surgery, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany.
2. Hospital for Orthopaedic and Trauma Surgery, Vulpiusklinik, Vulpiusstrasse 29, 74906 Bad Rappenau, Germany.
3. Orthopädische Klinik Paulinenhilfe, Diakonieklinikum, Rosenbergstrasse 38, 70192 Stuttgart, Germany.