1. Prevention and control of influenza: recommendations of the advisory committee on immunization practices (ACIP). MMWR Morb Mortal Wkly Rep 2000;49 (RR03) 1–38.
2. Behavioral Risk Factor Surveillance System, 1999. Survey data, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, US Department of Health and Human Services. Available at: http://www2.cdc.gov/nccdphp/brfss. December 26, 2000.
3. A hospital-based influenza immunization program;Fedson;Am. J. Public Health,1977
4. Hospital-based influenza and pneumococcal vaccination: Sutton's Law applied to prevention;Fedson;Infect. Control Hosp. Epidemiol.,2000
5. American Hospital Association Technical Panel on Infections within Hospitals. Management advisory–health care delivery: immunization. Am J Infect Control 1994;22:42-6.