1. Department of Stomatognathic Physiology, Specialist Dental Care Center The Mälar Hospital, Eskilstuna, Sweden;
2. Postgraduate Dental Education Center, Orofacial Pain and Jaw Function, Örebro, Sweden;
3. Department of Stomatognathic Physiology, Institute of Odontology, Jönköping, Sweden;
4. Centre for Clinical Research Västerås, Uppsala University, Västerås, Sweden;
5. Faculty of Odontology, Malmö University, Malmö, Sweden