1. Department of PeriodonticsSchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA
2. Department of Periodontics School of Dental MedicineUniversitat Internacional de CatalunyaSant Cugat del VallèsSpain
3. Department of PeriodontologySchool and Hospital of StomatologyPeking UniversityBeijingChina
4. Department of Periodontics New Jersey Dental SchoolUniversity of Medicine and Dentistry of New Jersey (UMDNJ)NewarkNew JerseyUSA
5. Department of PathologySchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA