1. Department of Orthopedics and Traumatology, University Medical Center, Johannes Gutenberg University Mainz, 55131 Mainz, Germany
2. Department of Foot and Ankle Surgery, Berufsgenossenschaftliche Unfallklinik Frankfurt Am Main, 60389 Frankfurt, Germany
3. Praxis für Gelenkchirurgie Bad Kreuznach, 55543 Bad Kreuznach, Germany