1. Faculty of Dentistry; University of Medical Science; La Habana Cuba
2. The University of Hong Kong; Prince Philip Dental Hospital; Hong Kong SAR China
3. School of Dentistry; University of Padua; Padova Italy
4. ARDEC; Ariminum Odontologica; Rimini Italy
5. UNESP - Faculdade de Odontologia de Araçatuba; UNESP - Universidade Estadual Paulista; São Paulo Brasil