@misc{9713,
  author = {F. de Vries and E. Setakis and B. Zhang and T. van Staa},
  title = {Long-acting beta2-agonists in adult asthma and the pattern of risk of death and severe asthma outcomes: a study using the GPRD},
  year = {2010},
  journal = {Eur Respir J},
  volume = {36},
  number = {3},
  pages = {494-502},
  issn = {0903-1936},
  doi = {10.1183/09031936.00124209},
}