1. Tribology Laboratory, School of Civil and Mechanical EngineeringCurtin University Australia
2. Department of Sports Science and Clinical BiomechanicsUniversity of Southern Denmark Odense Denmark
3. Research Unit for General Practice, Department of Public HealthUniversity of Southern Denmark Odense Denmark
4. Department of Orthopedics and TraumatologyOdense University Hospital Odense Denmark
5. Department of Clinical ResearchUniversity of Southern Denmark Odense Denmark
6. School of Behavioural and Health ScienceAustralian Catholic University Brisbane Queensland Australia
7. Department of RadiologyOdense University Hospital Odense Denmark
8. Clinical Epidemiology Unit, Orthopedics, Department of Clinical Sciences LundLund University Lund Sweden
9. Clinical Epidemiology Research and Training UnitBoston University School of Medicine Boston Massachusetts