title: Khat chewing is a risk factor of duodenal ulcer.
authors.forename: Y A
authors.initials: YA
authors.lastname: Raja'a
authors.forename: T A
authors.initials: TA
authors.lastname: Noman
authors.forename: A K
authors.initials: AK
authors.lastname: Al-Warafi
authors.forename: N A
authors.initials: NA
authors.lastname: Al Mashraki
authors.forename: A M
authors.initials: AM
authors.lastname: Al Yosofi
mesh_terms: D029754:Catha; D004381:Duodenal Ulcer / Q000139:chemically induced*; D006801:Humans; D010936:Plant Extracts / Q000009:adverse effects*; D012307:Risk Factors; D015006:Yemen
chemical_list: D010936:Plant Extracts