@misc{9841,
  author = {J. Griffin and S. Lee and M. Caiado and S. Kesten and D. Price},
  title = {Comparison of tiotropium bromide and combined ipratropium/salbutamol for the treatment of COPD: a UK General Practice Research Database 12-month follow-up study},
  year = {2008},
  journal = {Prim Care Respir J},
  volume = {17},
  number = {2},
  pages = {104-10},
  issn = {1471-4418 (Print) 1471-4418},
  doi = {10.3132/pcrj.2008.00024},
}