@misc{567,
  author = {National System.},
  title = {National Nosocomial Infections Surveillance (NNIS) System Report, data summary from January 1992 through June 2004},
  year = {2004},
  url = {https://www.cdc.gov/nhsn/pdfs/datastat/nnis_2004.pdf},
  language = {eng},
}