@misc{9914,
  author = {K. Wurst and S. Ephross and J. Loehr and D. Clark and H. Guess},
  title = {Evaluation of the General Practice Research Database congenital heart defects prevalence: comparison to United Kingdom national systems},
  year = {2007},
  journal = {Birth Defects Res A Clin Mol Teratol},
  volume = {79},
  number = {4},
  pages = {309-16},
  issn = {1542-0752 (Print) 1542-0752},
  doi = {10.1002/bdra.20356},
}