title: [Gastrointestinal hemorrhage of unknown origin. Clinical varieties and epidemiology].
authors.affiliation: Facultad de Medicina León, León, Gto., México.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Santoyo-Valenzuela
mesh_terms: D000328:Adult; D000367:Age Factors; D053704:Capsule Endoscopy; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology* / Q000401:mortality; D006801:Humans; D008297:Male; D009780:Occult Blood; D012737:Sex Factors; D014944:World Health Organization