1. Department of Orthopaedics University of Utah Salt Lake City Utah USA
2. Department of Orthopaedics University Hospital of Ghent Ghent Belgium
3. Department of Orthopaedics University Hospital Basel Basel Switzerland
4. Department of Epidemiology University of Utah Salt Lake City Utah USA
5. Department of Orthopaedics, Trauma, and Reconstructive Surgery University Medical Center Hamburg‐Eppendorf Hamburg Germany
6. Department of Trauma Surgery Orthopaedics, and Sports Traumatology, BG Hospital Hamburg Hamburg Germany