1. Department of Conservative Dentistry, Periodontology and Endodontology University Centre of Dentistry, Oral Medicine and Maxillofacial Surgery, University Hospital Tübingen Tübingen Germany
2. Private practice Meller Zahngesundheit Waiblingen Germany
3. Department of Periodontology, Endodontology and Cariology University Center for Dental Medicine, University of Basel Basel Switzerland