1. Youth Risk Behavior Surveillance-United States, 1997;Kann;MMWR,1998
2. Passive smoking and the risk of coronary heart disease: a meta-analysis of epidemiologic studies;He;N Engl J Med,1999
3. The burden of environmental tobacco smoke exposure on the respiratory health of children 2 months through 5 years of age in the United States: third national health and nutrition examination survey, 1988 to 1994;Gergen;Pediatrics,1998