1. Department of Operative Dentistry and Preventive Dentistry; Charité - Universitätsmedizin Berlin; Berlin Germany
2. Department of Operative Dentistry; Center for Dentistry and Oral Medicine (Carolinum); Goethe-University Frankfurt; Frankfurt Germany
3. Department of Medical Psychology and Medical Sociology; Medical Faculty; TU Dresden; Dresden Germany
4. Department of Operative Dentistry and Periodontology; Medical Faculty; University of Freiburg; Freiburg Germany
5. Students Deanery; Medical Faculty; University of Freiburg; Freiburg Germany