Smoking cessation and bronchial epithelial remodelling in COPD: a cross-sectional study - Lapperre, Thérèse S.; Sont, Jacob K.; Schadewijk, Annemarie van; Gosman, Margot M. E.; Postma, Dirkje S.; Bajema, Ingeborg M.; Timens, Win; Mauad, Thais; Hiemstra, Pieter S. (Respiratory Research, 2007)