TY - JOUR AU - Brusse-Keizer, M G; Grotenhuis, A J; Kerstjens, H A TI - Relation of sputum colour to bacterial load in acute exacerbations of COPD JO - Respir Med VL - 103 PY - 2009 DO - 10.1016/j.rmed.2008.10.012 L3 - PubMed-ID: 19027281 SP - 601 EP - 606 N1 - et al. ER -