1. School of Dentistry, Department of Medical Biotechnologies, University of Siena, Siena, Italy
2. Postgraduate School of Orthodontics, University of Ferrara, Ferrara, Italy
3. Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
4. Department of Oral and Maxillofacial, Diseases, University of Helsinki, Helsinki, Finland