1. Section of PeriodontologyDepartment of Conservative DentistryClinic for OralDental and Maxillofacial DiseasesUniversity Hospital Heidelberg Heidelberg Germany
2. Private Practice Bielefeld Germany
3. Institute of Medical Biometry and Informatics (IMBI)University Hospital Heidelberg Heidelberg Germany
4. Department of PeriodontologyCenter of Dentistry and Oral Medicine (Carolinum)Johann Wolfgang Goethe‐University Frankfurt/Main Frankfurt Germany