1. Department of Oral and Maxillofacial Surgery; Rijnstate Hospital Arnhem; Arnhem Netherlands
2. Department of Oral and Maxillofacial Surgery; Radboud University Medical Center; Nijmegen Netherlands
3. Department of Oral and Maxillofacial Surgery, Division of Dentistry, Faculty of Biology, Medicine and Health; The University of Manchester; Manchester UK
4. Hospital Dental Department; Canterbury District Health Board; Christchurch New Zealand
5. Radboud Institute for Health Sciences, Department for Health Evidence; Radboud University Medical Center; Nijmegen Netherlands
6. Department of Oral and Maxillofacial Surgery; Rijnstate Hospital; Arnhem Netherlands
7. Department of Quality and Safety of Oral Health Care, College of Dental Science; Radboud University Medical Center; Nijmegen Netherlands
8. School of Dentistry; Radboud University Nijmegen Medical Centre; Nijmegen Netherlands