Khat chewing is a risk factor of duodenal ulcer
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Citation
Raja'a, Y.A., Noman, T.A., Al Warafi, A.K., Al Mashraki, N.A. & Al Yosofi, A.M. (2001). Khat chewing is a risk factor of duodenal ulcer. EMHJ - Eastern Mediterranean Health Journal, 7 (3), 568-570, 2001 https://iris.who.int/handle/10665/119059