Predisposing factors to bacterial colonization in chronic obstructive pulmonary disease
R Zalacain, V Sobradillo, J Amilibia, J Barron, V Achotegui, JI Pijoan, JL Llorente
European Respiratory Journal 1999 13: 343-348; DOI: 10.1034/j.1399-3003.1999.13b21.x