Cytokine and chemokine concentrations in endobronchial tissue homogenates: These will be measured in homogenates of 2 biopsies by electrochemiluminescence using the SECTOR Imager 6000 and assay kits produced by Meso Scale Discovery. The MS6000 Human TH1/TH2 10-Plex Base Kit will be used to measure IFN-gamma, IL-1beta, IL-2, IL-4, IL-5, IL-10, IL-12p70, IL-13, TNF-alpha. The MS6000 Human Chemokine 9-Plex Base Kit will be used to measure Eotaxin, Eotaxin-3, IL-8, IP-10, MCP-1, MCP-4, MDC, MIP-1beta, TARC.