1. Division of Orthodontics Department of Neurosciences, Reproductive Sciences and Oral Sciences University of Naples ‘Federico II’ Naples Italy
2. Department of Oral Diagnostic Sciences University at Buffalo Buffalo NY USA
3. Medical Statistics Unit Department of Mental Health and Preventive Medicine University of Campania ‘Luigi Vanvitelli’ Naples Italy
4. Department of Orofacial Pain and Dysfunction Academic Centre for Dentistry Amsterdam (ACTA) University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands