peptic ulcer

Validity of peptic ulcer disease and upper gastrointestinal bleeding diagnoses in administrative databases: a systematic review protocol
Alessandro Montedori, Iosief Abraha, Carlos Chiatti, Francesco Cozzolino, Massimiliano Orso, Maria Laura Luchetta, Joseph M Rimland, Giuseppe Ambrosio

BMJ Open Sep 2016, 6 (9) e011776; DOI: 10.1136/bmjopen-2016-011776

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peptic ulcer