TY - JOUR AU - Halbert, R J; Natoli, J L; Gano, A TI - Global burden of COPD: systematic review and meta-analysis JO - Eur Respir J VL - 28 PY - 2006 DO - 10.1183/09031936.06.00124605 L3 - PubMed-ID: 16611654 SP - 523 EP - 532 N1 - et al. ER -