1. Radboud University Medical Center; Department of Oral and Maxillofacial Surgery; Geert Grooteplein Zuid 14 Nijmegen Netherlands 6525 GA
2. Rijnstate Hospital; Department of Oral and Maxillofacial Surgery; Arnhem Netherlands 6815 AD
3. Cardiff University School of Dentistry; Department of Orthodontics; Heath Park Cardiff UK CF14 4XY
4. The University of Manchester; Department of Oral and Maxillofacial Surgery, Division of Dentistry, Faculty of Biology, Medicine and Health; Coupland Buidling 3 Building, Oxford Road Manchester UK M13 9PL
5. Radboud University Medical Center; Radboud Institute for Health Sciences, Department for Health Evidence; Nijmegen Netherlands 6525EZ
6. Radboud University Medical Center; Department of Quality and Safety of Oral Health Care, College of Dental Science; PO Box 9101 Nijmegen Netherlands 6500 HB
7. The National Institute for Development of Clinical Practices Guidelines in Oral Care (KiMo); Utrecht Netherlands