Development and validation of a cross-cultural questionnaire to evaluate nonulcer dyspepsia: The Porto Alegre dyspeptic symptoms questionnaire (PADYQ) von BECKER SANDER, Guilherme, MAZZOLENI, Luiz Edmundo, BEHEREGARAY, Simone, MATIOTI, Simone, SOMM, Gustavo, GOLDIM, Jose Roberto, FERNANDO, Carlos, FRANCESCONI, Magalhaes, CASTAGNA WORTMANN, André, OTT, Eduardo Andre, THEIL, Alexandro, DA CRUZ PICCOLI, Vicenzo, DA SILVA, Angela Cristiane, OLIVEIRA, Leandro

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