Association of Lung Inflammatory Cells with Small Airways Function and Exhaled Breath Markers in Smokers – Is There a Specific Role for Mast Cells? - Nussbaumer-Ochsner, Yvonne; Stolk, Jan; Silva, Luiz F. Ferraz da; Schadewijk, Annemarie van; Jeu, Ronald C. de; Prins, Frans A.; Mauad, Thais; Rabe, Klaus F.; Hiemstra, Pieter S. (PLOS ONE, 2015)