@misc{indiciae761ba7aea959,
  title = {External validity of randomized controlled trials in COPD.},
  author = {Justin Travers and Suzanne Marsh and Brent Caldwell and Mathew Williams and Sarah Aldington and Mark Weatherall and Philippa Shirtcliffe and Richard Beasley},
  year = {2006},
  doi = {10.1016/j.rmed.2006.10.011},
  url = {https://pubmed.ncbi.nlm.nih.gov/17113277/},
  note = {Source identifier: 17113277}
}