@misc{8469,
  author = {K. Wing and E. Williamson and J. Carpenter and L. Wise and S. Schneeweiss and L. Smeeth and J. Quint and I. Douglas},
  title = {Real-world effects of medications for chronic obstructive pulmonary disease: protocol for a UK population-based non-interventional cohort study with validation against randomised trial results},
  year = {2018},
  journal = {BMJ Open},
  volume = {8},
  number = {3},
  pages = {e019475},
  issn = {2044-6055},
  doi = {10.1136/bmjopen-2017-019475},
}