1. Ariminum Odontologica; ARDEC; Rimini Italy
2. Prince Philip Dental Hospital; The University of Hong Kong; Hong Kong Hong Kong SAR China
3. University of Zurich; Zurich Switzerland
4. Faculty of Dentistry; University of Medical Science; La Habana Cuba
5. Faculty of Dentistry of Araçatuba; UNESP - Univ Estadual Paulista; São Paulo Brazil