Preoperative six-min walking distance does not predict pulmonary complications in upper abdominal surgery - Paisani, Denise M.; Fiore Jr., Julio F.; Lunardi, Adriana C.; Colluci, Daniela B. B.; Santoro, Ilka Lopes; Carvalho, Celso R. F.; Chiavegato, Luciana Dias; Faresin, Sonia Maria (Respirology, 2012)