1. Harvard School of Dental Medicine Boston Massachusetts USA
2. Tufts University School of Dental Medicine Boston Massachusetts USA
3. School of Dentistry in Baltimore University of Maryland College Park Maryland USA
4. UNC Adams School of Dentistry Chapel Hill North Carolina USA
5. The Ohio State University College of Dentistry ColumbusOhioUSA
6. Faculty of Odonto‐Stomatology Huế University of Medicine and Pharmacy Huế Vietnam
7. Huế University of Medicine and Pharmacy Huế Vietnam
8. Faculty of Odonto‐Stomatology, Huế University of Medicine and Pharmacy Huế Vietnam
9. Faculty at Harvard School of Dental Medicine Brookline Massachusetts USA