1. Section of Periodontology; Department of Conservative Dentistry Clinic for Oral, Dental and Maxillofacial Diseases; University Hospital Heidelberg; Heidelberg Germany
2. Department of Periodontology; Center of Dentistry and Oral Medicine (Carolinum); Johann Wolfgang Goethe-University Frankfurt/Main; Frankfurt Germany
3. Institute of Medical Biometry and Informatics (IMBI); University Hospital Heidelberg; Heidelberg Germany
4. Section of Endodontics and Dental Traumatology; Department of Conservative Dentistry Clinic for Oral, Dental and Maxillofacial Diseases; University Hospital Heidelberg; Heidelberg Germany
5. Private Dental Practice; Weilburg Germany