1. AO Research Institute Davos Davos Switzerland
2. Department of Orthopedics University Medical Center Utrecht Utrecht the Netherlands
3. Department of Spine Surgery The First Affiliated Hospital of Sun Yat‐sen University Guangzhou P. R. China
4. Department of Orthopaedic Surgery and Traumatology Inselspital, Bern University Hospital, University of Bern Bern Switzerland
5. Faculty of Veterinary Medicine Utrecht University Utrecht the Netherlands