RT Journal Article SR Electronic T1 “Reproducibility of 6-minute walking test in patients with COPD”. N.A. Hernandes, E.F.M. Wouters, K. Meijer, J. Annegarn, F. Pitta and M.A. Spruit. Eur Respir J 2011; 38: 261–267. JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1583 OP 1583 DO 10.1183/09031936.50142010 VO 40 IS 6 YR 2012 UL http://erj.ersjournals.com/content/40/6/1583.2.abstract AB