1. Centers for Disease Control and Prevention. Influenza: the disease: the flu season. 2010a. Available at: http://www.cdc.gov/flu/about/season/flu-season.htm. Accessed September 13, 2010.
2. Economic analysis of influenza vaccination and antiviral treatment for healthy working adults;Lee;Ann Intern Med,2002
3. Influenza seasonality: underlying causes and modeling theories;Lofgren;J Virol,2007
4. Centers for Disease Control and Prevention. 2009 H1N1-related deaths, hospitalizations and cases: details of extrapolations and ranges: United States. Emerging Infections Program (EIP) data. 2010b. Available at: http://www.cdc.gov/h1n1flu/estimates_2009_h1n1.htm/. Accessed 20 July 2012.
5. Estimates of deaths associated with seasonal influenza --- United States, 1976-2007;Centers for Disease Control and Prevention (CDC);MMWR Morb Mortal Wkly Rep,2010