PT - JOURNAL ARTICLE AU - M. L. Duiverman AU - F. M. Struik AU - P. J. Wijkstra TI - Noninvasive ventilation in severe stable COPD: is it effective, and if so, in what way? AID - 10.1183/09031936.00168207 DP - 2008 May 01 TA - European Respiratory Journal PG - 1136--1137 VI - 31 IP - 5 4099 - http://erj.ersjournals.com/content/31/5/1136.short 4100 - http://erj.ersjournals.com/content/31/5/1136.full SO - Eur Respir J2008 May 01; 31