1. U.S. Census Population Estimates [on-line] http://www.census.gov/popest/data/historical/index.html
2. CDC WONDER Multiple Cause of Death Data [on-line] http://wonder.cdc.gov/mcd.html
3. U.S. National Center for Health Statistics National Vital Statistics Reports, Deaths: Preliminary Data for 2010, Vol. 60, No. 4, January 2012 [on-line] www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_04.pdf
4. World Health Organization International Statistical Classification of Diseases and Related Health Problems, 10th Revision [on-line] http://apps.who.int/classifications/icd10/browse/2010/en