@misc{9852,
  author = {T. van Staa and L. Smeeth and I. Persson and J. Parkinson and H. Leufkens},
  title = {Evaluating drug toxicity signals: is a hierarchical classification of evidence useful or a hindrance?},
  year = {2008},
  journal = {Pharmacoepidemiol Drug Saf},
  volume = {17},
  number = {5},
  pages = {475-84},
  issn = {1053-8569},
  doi = {10.1002/pds.1568},
}