1. Center for Orthopedics and Trauma Surgery University Hospital Giessen and Marburg Marburg Germany
2. Center of Trauma Surgery University Hospital Zuerich Zürich Switzerland
3. Center for Orthopedics and Trauma Surgery, DRK‐Kliniken Nordhessen Kassel Germany
4. Department of Orthopedic Trauma Cantonal Hospital Lucerne Lucerne Switzerland