| Affiliation: | 1. Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands;2. Department of Health Sciences, Community and Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands;3. Departments of Oral and Maxillofacial Surgery and Fixed and Removable Prosthodontics, Dental School, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands |
