[1] University Hospital,Department of Conservative Dentistry and Periodontology
[2] Ludwig-Maximilian University,Department of Orthodontics and Dentofacial Orthopedics
[3] University Hospital,Institute of Medical Biometry and Epidemiology
[4] Ludwig-Maximilian Universität München,Department of Orthodontics, Section of Preventive and Paediatric Dentistry
[5] Ludwig-Maximilian University of Munich,Clinic for Operative Dentistry, Periodontology and Preventive Dentistry
[6] University Hospital,Department of Operative Dentistry and Periodontology, Faculty of Dentistry
[7] University Hospital RWTH Aachen,School of Dental Medicine
[8] University Medical Centre,Clinic of Periodontology, Endodontology and Cariology
[9] University of Bern,Department of Dermatology
[10] University Centre for Dental Medicine Basel,Department of Odontology
[11] University of Basel,Department of Dentistry
[12] Inselspital-Bern University Hospital,Poliklinik Für Zahnerhaltung Und Parodontologie
[13] University Copenhagen,undefined
[14] Radboud University Medical Centre,undefined
[15] Klinikum Der Universität München,undefined
[16] LMU München,undefined