1. University of Iowa Iowa City Iowa USA
2. University of Erlangen‐Nuremberg Erlangen Germany
3. Christiana Care/Thomas Jefferson University Philadelphia Pennsylvania USA
4. University of California San Francisco San Francisco California USA
5. University Hospital Augsburg Augsburg Germany
6. Institut d'Explorations Fonctionnelles des Glandes Salivaires Paris France
7. Harvard Medical School Boston Massachusetts USA
8. University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
9. University of Iowa Hospitals and Clinics Iowa City Iowa USA
10. University of Wisconsin School of Medicine and Public Health Madison Wisconsin USA
11. The George Washington University Washington District of Columbia USA
12. University of California San Francisco California USA
13. University of Tennessee Health Science Center College of Medicine Memphis Tennessee USA
14. Geisinger Health System Danville Pennsylvania USA
15. Stanford University Stanford California USA
16. Kaiser Permanente Los Angeles Medical Center Los Angeles California USA
17. Thomas Jefferson University Hospital Philadelphia Pennsylvania USA
18. Louisiana State University HSC New Orleans Louisiana USA
19. Faculdade de Ciencias Medicas da Santa Casa de Sao Paulo Brazil Sao Paulo Brazil
20. Johns Hopkins Medical Institutions Campus Baltimore Maryland USA
21. Northwestern University Feinberg School of Medicine Chicago Illinois USA