1 Department of Oral and Maxillofacial Surgery, Amsterdam University Medical Center and Amstelland Hospital, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, the Netherlands.
2 Departments of Oral and Maxillofacial Surgery, Amsterdam University Medical Centers and Northwest Clinics, University of Amsterdam, Amsterdam, the Netherlands.
3 Department of Oral Public Health, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
4 Department of Oral and Maxillofacial Surgery, Amsterdam University Medical Center and Amstelland Hospital, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, the Netherlands. j.a.lindeboom@amc.uva.nl.