1. Department of Biomedical and Neuromotor Sciences University of Bologna; Bologna; Italy
2. Prince Philip Dental Hospital; The University of Hong Kong; Hong Kong (SAR) China
3. ARDEC; Ariminum Odontologica; Rimini Italy
4. Faculty of Dentistry; University of Medical Science; La Habana Cuba
5. UNESP - Faculty of Dentistry of Araçatuba; São Paulo State University; São Paulo Brazil