1. Department of Odontology/Clinical Oral Physiology, Faculty of Medicine, University of Umeå, Umeå, Sweden
2. Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit, Amsterdam, the Netherlands
3. Northern Register Centre, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
4. Department of Orofacial Pain and Jaw function, Faculty of Odontology, Malmö University, Malmö, Sweden