title: Letter: Scoring systems for upper gastrointestinal bleeding.
authors.forename: F I
authors.initials: FI
authors.lastname: Téllez-Ávila
authors.forename: S
authors.initials: S
authors.lastname: García-Osogobio
authors.forename: N
authors.initials: N
authors.lastname: Chávez-Tapia
mesh_terms: D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008297:Male; D012720:Severity of Illness Index