1. Unit Scholar; Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
2. University of Berne; Berne Switzerland
3. University of Zurich; Zurich Switzerland
4. Department of Biomedical and Neuromotorial Science; University of Bologna; Bologna Italy
5. UNESP - São Paulo State University; Faculty of Dentistry of Araçatuba (SP); Araçatuba Brazil
6. ARDEC; Ariminum Odontologica; Rimini Italy