1. Columbia University; New York NY USA
2. Universidad Complutense Madrid; Madrid Spain
3. Ege University; Izmir Turkey
4. University of Birmingham; Birmingham United Kingdom
5. Universidade Guarulhos; Guarulhos Brazil
6. Rutgers University; Newark NJ USA
7. University of Hong Kong; Hong Kong SAR China
8. Boston University; Boston MA USA
9. University of Michigan; Ann Arbor MI USA
10. University of Pisa; Pisa Italy
11. University of Louisville; Louisville KY USA
12. Private practice; Cupertino CA USA
13. Bonn University; Bonn Germany
14. University of Pennsylvania; Philadelphia PA USA
15. University at Buffalo; Buffalo NY USA
16. Greifswald University; Greifswald Germany
17. The Ohio State University; Columbus OH USA
18. Academic Center for Dentistry (ACTA); University of Amsterdam and Vrije Universiteit Amsterdam; Amsterdam The Netherlands
19. Rambam Health Care Campus & Israel Institute of Technology; Haifa Israel
20. Peking University; Beijing China
21. University of Geneva; Geneva Switzerland
22. University College London; London United Kingdom
23. University of North Carolina; Chapel Hill NC USA
24. University of Queensland; Brisbane Australia