1. 1Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland
2. 2Department of Surgery, Kantonsspital Graubuenden, Chur, Switzerland
3. 3Department of Orthopaedic Surgery, UC Davis Medical Center, Sacramento, California, USA
4. 4AO Innovation Translation Center, AO Foundation, Davos, Switzerland
5. 5Sutter Roseville Medical Center, Roseville, California, USA