RT Journal Article SR Electronic T1 Heart failure impairs cerebral oxygenation during exercise in patients with COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1423 OP 1426 DO 10.1183/09031936.00090913 VO 42 IS 5 A1 Mayron F. Oliveira A1 Flavio Arbex A1 Maria Clara N. Alencar A1 Aline Soares A1 Audrey Borghi-Silva A1 Dirceu Almeida A1 J. Alberto Neder YR 2013 UL http://erj.ersjournals.com/content/42/5/1423.abstract AB