1. ARDEC; Ariminum Odontologica; Rimini Italy
2. The University of Hong Kong; Prince Philip Dental Hospital; Hong Kong SAR China
3. University of Zurich; Zurich Switzerland
4. Private Practice; San Marino Republic of San Marino
5. Faculty of Dentistry; University of Medical Science; La Habana Cuba
6. Departamento de Ciencia de la Salud Corporación Universitaria Rafael Núñez; Cartagena de indias; Bolívar Colombia
7. Faculdade de Odontologia de Araçatuba; UNESP - Universidade Estadual Paulista; Araçatuba SP Brasil