title: [A look over the boundaries. The khat problem in Yemen].
authors.affiliation: Klinik für Allgemein- und Visceralchirurgie am Lukas-Krankenhaus Bünde.
authors.forename: T
authors.initials: T
authors.lastname: Emmanouilidis
mesh_terms: D029754:Catha; D000697:Central Nervous System Stimulants; D003430:Cross-Sectional Studies; D003906:Developing Countries; D006801:Humans; D015994:Incidence; D010936:Plant Extracts; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000209:etiology; D015006:Yemen / Q000453:epidemiology
chemical_list: D000697:Central Nervous System Stimulants; D010936:Plant Extracts