1. School of Dentistry; University of Padova; Padova Italy
2. Department of Oral Health Sciences; K.U. Leuven and Department of Dentistry; University Hospitals Leuven; Leuven Belgium
3. Orofacial Pain & TMD Clinic; Department of Oral Rehabilitation; The Goldschleger School of Dental Medicine; Tel Aviv Israel
4. Department of Oral and Maxillofacial Diseases; Faculty of Medicine; University of Helsinki; Helsinki Finland