@misc{indiciaea894b1a759e7,
  title = {Representativeness of samples from general practice lists in epidemiological studies: case-control study.},
  author = {A G Smith and N T Fear and G R Law and E Roman},
  year = {2004},
  doi = {10.1136/bmj.38029.672662.ae},
  url = {https://pubmed.ncbi.nlm.nih.gov/14990513/},
  note = {Source identifier: 14990513}
}