1. Department of Periodontology Faculty of Dentistry Medical University of Warsaw Warszawa Poland
2. Department of Oral and Maxillofacial Surgery University Hospital in Copenhagen (Rigshospitalet Copenhagen Ø Denmark
3. Interuniversity Institute for Biostatistics and Statistical Bioinformatics (I‐BioStat) Hasselt University Hasselt Belgium
4. Department of Statistics and Medical Informatics Faculty of Health Sciences Medical University of Bialystok Białystok Poland
5. Department of Orthodontics Faculty of Dentistry Medical University of Warsaw Warszawa Poland