Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
G.C. Donaldson and T.A.R. Seemungal and I.S. Patel and S.J. Lloyd-Owen and T.M.A. Wilkinson and J.A. Wedzicha,"Longitudinal changes in the nature, severity and frequency of COPD exacerbations",European Respiratory Journal,0903-1936,European Respiratory Society (ERS),2003-12-01,22,6,931-936,https://cir.nii.ac.jp/crid/1360855568793306880,https://doi.org/10.1183/09031936.03.00038303