@misc{indiciae8d391ba467d9,
  title = {Overview: surveillance and sentinel systems.},
  author = {J S Marr},
  year = {1998},
  doi = {10.1007/bf02427696},
  url = {https://pubmed.ncbi.nlm.nih.gov/9762647/},
  note = {Source identifier: 9762647}
}