1. Department of Oral Diagnostics, Faculty of Odontology, Malmö University, Malmö, Sweden;
2. Department of Oral Prosthodontics, the Eastman Institute, Public Dental Health, Stockholm, Sweden;
3. Department of Odontology, Prosthetic Dentistry, Umeå University, Umeå, Sweden;
4. Department of Orofacial Pain and Jaw Function, Faculty of Odontology, Malmö University, Malmö, Sweden