1. 45 CFR 46.102(d).
2. McCaig LF, Burt CW. National Hospital Ambulatory Medical Care Survey: 2003 emergency department summary. Advance data from vital and health statistics; No. 358. Hyattsville, MD: National Center for Health Statistics. Available at: http://www.cdc.gov/nchs/data/ad/ad358.pdf. Accessed July 16, 2006.
3. Comprehensive plan for epidemiologic surveillance;Centers for Disease Control and Prevention,1986
4. Overview of syndromic surveillance. What is syndromic surveillance?;Henning;MMWR,2004
5. Begier EM, Sockwell D, Branch LM, et al. The national capitol region's emergency department syndromic surveillance system: do chief complaint and discharge diagnosis yield different results? Emerg Infect Dis [serial online] 2003 Mar. Available at: http://www.cdc.gov/ncidod/EID/vol9no3/02-0363.htm. Accessed March 7, 2005.