TY - JOUR AU - Herth, F J; Noppen, M; Valipour, A TI - Efficacy predictors of lung volume reduction with Zephyr valves in a European cohort JO - Eur Respir J VL - 39 PY - 2012 DO - 10.1183/09031936.00161611 SP - 1334 EP - 1342 N1 - et al. ER -