NCHS Dataline

Centers for Disease Control and Prevention (US). NCHS survey measures catalog [cited 2011 May 5]. Available from: URL: http://www.cdc.gov/nchs/measures_catalog.htm.

Niska RW Shimizu IM . Hospital preparedness for emergency response: United States, 2008. Natl Health Stat Rep 2011;37:1–14. Also available from: URL: http://www.cdc.gov/nchs/data/nhsr/nhsr037.pdf [cited 2011 May 5].

Kockanek KD Xu J Murphy SL Minino AM Kung HC . Deaths: preliminary data for 2009. Natl Vital Stat Rep 2011 Mar 16;59:1–68.