1. College of Dental Medicine, QU Health, Qatar University, Doha 2713, Qatar
2. Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada
3. Faculty of Dentistry, McGill University, Montreal, QC H3A 1G1, Canada
4. School of Dentistry, University of Sao Paulo, São Paulo 05508-000, Brazil
5. Faculty of Dental Surgery, University of Malta, MSD 2080 Msida, Malta