1. Department of Health and Human Sciences, London Metropolitan University, London, United Kingdom
2. Chester Knee Clinic, The Grosvenor Nuffield Hospital, Chester, United Kingdom
3. Academy for Physiotherapy of the General Hospital of Vienna, Vienna, Austria
4. Department of Rheumatology, University Hospital Leuven, Leuven, Belgium
5. Department of Traumatology, Medical University of Vienna, Vienna, Austria