1. Department of Oral and Maxillofacial Surgery Thamar University Thamar Yemen
2. Department of Oral and Maxilofacial Surgery Cairo University Cairo Egypt
3. Center for Orofacial Pain University of California at San Francisco San Francisco CA USA
4. Division of Oral Diagnostics and Rehabilitation Department of Dental Medicine Karolinska Institutet Huddinge Sweden
5. Scandinavian Center for Orofacial Neuroscience Huddinge Sweden