Al-Ahmad, M. ., B. . Ezzat, . S. . S, and A. J. . O. “Evaluation of the Salivary Flow Rate and PH in Patients With Recurrent Oral Ulcers”. IIUM Medical Journal Malaysia, vol. 17, no. 2, Nov. 2020, doi:10.31436/imjm.v17i2.271.