Is lifestyle decisions or medical care the biggest reason why American life expectancy is lagging other countries?

A more than 400 page recent report from The National Research Council and The Institute of Medicine of the National Academy of Sciences (“U.S. Health in International Perspective: Shorter Lives, Poorer Health”) finds that children, men, and women all have shorter life expectancies in the United States than in Japan, Canada, Australia, and 13 European countries.