@article{0318e6e25b5042b2848ce6c8507aea4e,
title = "Use of the General Practice Research Database (GPRD) for respiratory epidemiology: a comparison with the 4th Morbidity Survey in General Practice (MSGP4)",
author = "Anna Hansell and Jen Hollowell and Tom Nichols and Rosie McNiece and David Strachan",
year = "1999",
language = "English",
volume = "54",
pages = "413--419",
journal = "Thorax - An International Journal of Respiratory Medicine",
issn = "0040-6376",
publisher = "BMJ Publishing Group",
number = "5",
}