1. Department of Odontology Clinical Oral Physiology Faculty of Medicine Umeå University Umeå Sweden
2. Department of Orofacial Pain and Jaw Function Faculty of Odontology Malmö University Malmö Sweden
3. Department of Research and Development Umeå University Sundsvall Sweden
4. Department of Occupational Health Science and Psychology Faculty of Health and Occupational Studies University of Gävle Gävle Sweden