[1] Queen Mary Univ London, Royal London Hosp, Inst Dent, Ctr Dent Publ Hlth & Primary Care,Barts & London S, London E1 2AD, England
[2] Al Wataniya Private Univ, Dept Oral Med & Pathol, Hama, Syria
[3] Univ Sharjah, Coll Dent Med, Dept Orthodont Pediat & Community Dent, Sharjah, U Arab Emirates
[4] Jordan Univ Sci & Technol, Dept Prevent Dent, Irbid, Jordan
[5] Alexandria Univ, Fac Dent, Dept Pediat Dent & Dent Publ Hlth, Alexandria, Egypt
[6] Karolinska Inst, Dept Global Hlth, Stockholm, Sweden
[7] Niuversity, Berlin, Germany
[8] Syrian Private Univ, Dept Restorat Dent & Endodont, Damascus, Syria
[9] Damascus Univ, Damascus, Syria
[10] Cairo Univ, Fac Dent, Dept Pediat Dent & Dent Publ Hlth, Cairo, Egypt
[11] Hassan II Univ Casablanca, Fac Dent, Dept Dentofacial Orthoped, Casablanca, Morocco
[12] Univ Monastir, Fac Dent Med, Dept Microbiol Immunol & Endodont, Monastir, Tunisia
[13] Thamar Univ, Fac Dent, Dept Periodontol, Dhamar, Yemen
[14] Imam Abdulrahman Bin Faisal Univ, Coll Dent, Dept Prevent Dent Sci, Dammam, Saudi Arabia
[15] Arab Amer Univ, Fac Grad Studies, Dept Dent Sci, Jenin, Palestine
[16] Univ Misurata, Misurata Fac Dent, Dept Conservat Dent & Endodont, Misurata, Libya
[17] Lebanese Univ, Fac Dent Med, Dept Pediat Dent & Dent Publ Hlth, Beirut, Lebanon
[18] Kuwait Univ, Fac Dent, Dept Dev & Prevent Sci, Al Ahmadi, Kuwait
[19] Al Manara Coll Med Sci, Dept Dent, Amarah, Iraq