1. Department of Dental Science, European Master Degree in Oral Laser Applications, University of Liege, Liege, Belgium.
2. Department of Physics and Material Sciences, IFSC-University of São Paulo, São Paulo, Brazil.
3. Department of Oral Surgery, Dental Faculty, Lebanese University, Beirut, Lebanon.
4. Department of Dental Sciences, Faculty of Medicine, University of Liege, Liege, Belgium.