RT Journal Article SR Electronic T1 The responsiveness and validity of the CAMPHOR Utility Index JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00069708 A1 D.M. Meads A1 S.P. McKenna A1 N. Doughty A1 C. Das A1 W. Gin-Sing A1 J. Langley A1 J. Pepke-Zaba YR 2008 UL http://erj.ersjournals.com/content/early/2008/09/03/09031936.00069708.abstract AB