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