1. Department of Orthopaedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
2. School of Medicine and Health Sciences, Division of Orthopedics at Campus Pius-Hospital, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany
3. Department of Human Movement Sciences, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands