1. Karolinska Institutet; Institute of Environmental Medicine; Box 210 SE-17177 Stockholm Sweden
2. Karolinska Institutet; Department of Neurobiology, Care Sciences and Society, Division of Physiotherapy; Alfred Nobels Allé 23 Huddinge Sweden 141 83
3. University of Zurich; Horten-Centre for patient oriented research and knowledge transfer; Zurich Switzerland
4. Rotterdam University of Applied Sciences; Research Centre Innovations in Care; Rochussenstraat 198 Rotterdam Netherlands 3015 EK Rotterdam
5. Erasmus Medical Center; Department of General Practice; PO Box 2040 Rotterdam Netherlands 3000 CA
6. VU University Amsterdam; Department of Health Sciences, Faculty of Earth and Life Sciences; PO Box 7057 Room U454 Amsterdam Netherlands 1007 MB
7. Bern University Hospital, University of Bern; Division of General Internal Medicine, Inselspital; Bern Switzerland