1. Department of Orthodontics; Faculty of Dentistry; University of Toronto, and University of Toronto Center for the Study of Pain; Toronto ON Canada
2. Department of Neuroscience; Reproductive and Oral Sciences; Section of Orthodontics; University of Naples Federico II; Naples Italy
3. Medical Statistics Unit; Seconda Università degli Studi di Napoli; Naples Italy
4. Department of Oral Diagnostic Sciences; Center for Orofacial Pain Research; University at Buffalo; Buffalo NY USA