1. Aesculap AG Research & Development, Am Aesculap-Platz, 78532 Tuttlingen, Germany
2. Joint Reconstruction Center, Seoul National University Bundang Hospital, Seongnam 463-707, Republic of Korea
3. Knee Division, The Rhine-Main Centre for Joint Diseases, Wilhelmstraße 30, 65183 Wiesbaden, Germany
4. Knee Division, The Muensterland Centre for Joint Diseases, Buelt 13, 48143 Muenster, Germany
5. Ludwig Maximilians University Clinic for Orthopaedic Surgery, Campus Grosshadern, Marchioninistraße 15, 81377 Munich, Germany