@misc{8849,
  author = {E. Merinopoulou and M. Raluy-Callado and S. Ramagopalan and S. MacLachlan and J. Khalid},
  title = {COPD exacerbations by disease severity in England},
  year = {2016},
  journal = {Int J Chron Obstruct Pulmon Dis},
  volume = {11},
  pages = {697-709},
  issn = {1176-9106},
  doi = {10.2147/copd.s100250},
}