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Independent effect of prior exacerbation frequency and disease severity on the risk of future exacerbations of COPD: a retrospective cohort study.
Margüello MS, Garrastazu R, Ruiz-Nuñez M, Helguera JM, Arenal S, Bonnardeux C, León C, Miravitlles M, García-Rivero JL. Margüello MS, et al. Among authors: helguera jm. NPJ Prim Care Respir Med. 2016 Sep 8;26:16046. doi: 10.1038/npjpcrm.2016.46. NPJ Prim Care Respir Med. 2016. PMID: 27604472 Free PMC article.