(Q33688885)
Statements
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Positive predictive value of ICD-9th codes for upper gastrointestinal bleeding and perforation in the Sistema Informativo Sanitario Regionale database (English)
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Cattaruzzi C
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Troncon MG
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Agostinis L
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García Rodríguez LA
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1 June 1999
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52
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499-502
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Identifiers
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1 reference