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Validation of diagnoses of peptic ulcers and bleeding from administrative databases: a multi-health maintenance organization study.

Andrade SE, Gurwitz JH, Chan KA, Donahue JG, Beck A, Boles M, Buist DS, Goodman M, LaCroix AZ, Levin TR, Platt R. Validation of diagnoses of peptic ulcers and bleeding from administrative databases: a multi-health maintenance organization study. J Clin Epidemiol. 2002 Mar; 55(3):310-3.

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