AL-Haddad, K. A., M. M. A. Al-Najhi, A.-K. M. Abbas, A. A. Y. Al-Akwa, H. A. Al-Shamahy, and M. A. Al-labani. “CLINICAL FEATURES, AGE AND SEX DISTRIBUTIONS, RISK FACTORS AND THE TYPE OF BACTERIA ISOLATED IN PERIODONTITIS PATIENTS IN SANA’A, YEMEN”. Universal Journal of Pharmaceutical Research, Vol. 6, no. 1, Mar. 2021, doi: