Sentiweb remains efficient tool for nationwide surveillance of disease.

@article{Flahault1997SentiwebRE,
  title={Sentiweb remains efficient tool for nationwide surveillance of disease.},
  author={Antoine Flahault and Eric Boussard and Jean François Vibert and A j Valleron},
  journal={BMJ},
  year={1997},
  volume={314 7091},
  pages={1418}
}