N. A. Alhemiary, B. Y. A. Mohammed, and S. M. Abdallah, “Evaluation of Accumulation of Lead and Cadmium in the Blood and Urine of Khat- Chewers in Some Areas of Ibb Governorate, Yemen”, JMPS, vol. 3, no. 3, pp. 15–1, Sep. 2019, doi: 10.26389/AJSRP.N230719.