1. Center for Dentistry and Oral Hygiene University Medical Center Groningen, University of Groningen Groningen the Netherlands
2. Stomatological Hospital Southern Medical University Guangzhou China
3. Medical Statistics and Decision‐Making, Department of Epidemiology University Medical Center Groningen, University of Groningen Groningen the Netherlands
4. Department of Maxillofacial Surgery University Medical Center Groningen, University of Groningen Groningen the Netherlands