Tabriz University of Medical Sciences Journal of Dental Research, Dental Clinics, Dental Prospects 2008-210X 5 3 2011 10 01 Update on Prevalence of Minor Aphtha and the Involved Factors in Tabriz, Northwest Iran 106 107 EN Mahmood Sina Mahmood Toorchi Sina Ghertasi Oskouei Journal Article 2011 03 08 2011 05 12