%0 Journal Article %A C.R. Esther %A N.E. Alexis %A M.L. Clas %A E.R. Lazarowski %A S.H. Donaldson %A C.M. Pedrosa Ribeiro %A C.G. Moore %A S.D. Davis %A R.C. Boucher %T Extracellular Purines are Biomarkers of Neutrophilic Airway Inflammation %D 2008 %R 10.1183/09031936.00089807 %J European Respiratory Journal %U https://erj.ersjournals.com/content/erj/early/2008/02/06/09031936.00089807.full.pdf