1. Dental Academy for Continuing Professional Development; Karlsruhe Germany
2. School for Dental Medicine, Clinic for Conservative Dentistry and Periodontology; Christian-Albrechts-University Kiel; Kiel Germany
3. Independent Researcher; Albstadt-Ebingen Germany
4. Clinic of Operative Dentistry, Periodontology and Preventive Dentistry; University Hospital, Saarland University; Homburg Germany
5. Center for Implantology and Oral Surgery; Heidelberg Germany