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