1. Department of Diagnostic Sciences; School of Dentistry; Louisiana State University Health Sciences Center; New Orleans LA USA
2. School of Dentistry; University of Padova; Padova Italy
3. Faculté de Médecine dentaire; Université Laval; Québec QC Canada
4. Department of Oral Health Sciences; K.U. Leuven; Leuven Belgium
5. Department of Dentistry; University Hospitals Leuven; Leuven Belgium