@misc{10373,
  author = {A. Hansell and J. Hollowell and T. Nichols and R. McNiece and D. Strachan},
  title = {Use of the General Practice Research Database (GPRD) for respiratory epidemiology: a comparison with the 4th Morbidity Survey in General Practice (MSGP4)},
  year = {1999},
  journal = {Thorax},
  volume = {54},
  number = {5},
  pages = {413-9},
  issn = {0040-6376 (Print) 0040-6376},
}