Gholami, N. ., Sabzvari, H. ., Razzaghi, A. ., & Salah, S. . (1969). Effect of stress, anxiety and depression on unstimulated salivary flow rate and xerostomia. Journal of Dental Research, Dental Clinics, Dental Prospects, 11(4), 247-252. https://doi.org/10.15171/joddd.2017.043 (Original work published 1969)