[1] Imam Abdulrahman Bin Faisal Univ, Coll Dent, Dept Prevent Dent Sci, Dammam, Saudi Arabia
[2] Imam Abdulrahman Bin Faisal Univ, Coll Dent, Dammam, Saudi Arabia
[3] Imam Abdulrahman Bin Faisal Univ, Coll Dent, Dept Dent Educ, Dammam, Saudi Arabia
[4] Univ Turku, Inst Dent, Turku, Finland
[5] Univ Bergen, Fac Med, Bergen, Norway