RT Journal Article SR Electronic T1 IL-18 production and pulmonary function in chronic obstructive pulmonary disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00019207 A1 H. Imaoka A1 T. Hoshino A1 S. Takei A1 T. Kinoshita A1 M. Okamoto A1 T. Kawayama A1 S. Kato A1 H. Iwasaki A1 K. Watanabe A1 H. Aizawa YR 2007 UL http://erj.ersjournals.com/content/early/2007/11/07/09031936.00019207.abstract AB