1. Maurits CFM de Kuijper, MSc, The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials, Groningen, the Netherlands
2. Marco MM Gresnigt, DMD, PhD, The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials; and Martini Hospital, Department of Special Dental Care, Groningen, the Netherlands
3. Marianne van den Houten, MSc, The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials, Groningen, the Netherlands
4. Djenice Haumahu, MSc, The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials, Groningen, the Netherlands
5. Ulf Schepke, DMD, PhD, The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials, Groningen, the Netherlands
6. Marco S Cune, DMD, PhD, The University of Groningen, University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials, Groningen, the Netherlands; St Antonius Hospital Nieuwegein, Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, Nieuwegein, the Netherlands; and University Medical Center U