1. Private Clinic for Oral Implantology & Reconstructive Dentistry, Implantologie Den Haag BV, Stadhouderslaan 12, 2517 HW The Hague, The Netherlands
2. Private Dental Clinic, Staas & Bergmans Zorg Voor uw Mond, Schubertsingel 32, 5216 XA Den Bosch, The Netherlands
3. Radboud Institute of Health Sciences, Department of Dentistry, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
4. Department of Oral and Maxillofacial Surgery, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
5. Department of Oral and Maxillofacial Surgery, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands