1. Department of Oral Maxillofacial Surgery, Amsterdam University Medical Center, Location AMC, 1105 AZ Amsterdam, The Netherlands
2. Department of Oral Maxillofacial Surgery, Noordwest Ziekenhuisgroep, 1815 JD Alkmaar, The Netherlands
3. Department of Oral Maxillofacial Surgery, Ziekenhuis Amstelland, 1186 AM Amstelveen, The Netherlands