1. Center for General Practice at Aalborg University, Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
2. Arthritis Research UK Primary Care Centre, Research Institute for Primary Care & Health Sciences, Keele University, Keele, Staffordshire, United Kingdom
3. Department of Human Anatomy and Psychobiology, University of Murcia, Campus de Espinardo, Murcia, Spain
4. Discipline of Physiotherapy, Faculty of Health Sciences, The University of Sydney, Sydney, Australia
5. Murcia Institute of Biomedical Research, IMIB-Arrixaca, Murcia, Spain;