1. Department of Physiotherapy, University College of Northern Denmark, Aalborg East, Denmark
2. Department of Physical and Occupational Therapy, Aarhus University Hospital, Palle Juul-Jensens, Aarhus N, Denmark
3. Research Unit for General Practice in Aalborg, Aalborg University, Aalborg East, Denmark
4. Department of Public Health, Aarhus University, Aarhus C, Denmark