Abebe, Dawit, Asfaw Debella, Amare Dejene, Ambaye, Degefa, Almaz Abebe, Kelbessa Urga, and Lemma Ketema. 2017. “Khat Chewing Habit As a Possible Risk Behaviour for HIV Infection: A Case-Control Study”. The Ethiopian Journal of Health Development 19 (3). https://ejhd.org/index.php/ejhd/article/view/636.