Columbia subject headings:
Harvard subject headings:
Emergency medical services--United States--Planning.
Epidemics--United States--Prevention.
H1N1 influenza--Prevention.
Health planning--United States.
Influenza--Government policy--United States.
Princeton subject headings:
Emergency medical services--United States--Planning.
Epidemics--United States--Prevention.
H1N1 influenza--Prevention.
Health planning--United States.
Influenza--Government policy--United States.