1. Department of Oral and Maxillofacial Surgery; University of Groningen; University Medical Center Groningen; Groningen The Netherlands
2. Department of Oral and Maxillofacial Surgery; VU University Medical Center and Academic Center for Dentistry Amsterdam; Amsterdam The Netherlands
3. Private Practice; Amsterdam The Netherlands
4. Department of Fixed and Removable Prosthodontics; Dental School; University of Groningen; University Medical Center Groningen; Groningen The Netherlands