Columbia subject headings:
Communicable diseases--Prevention--Statistics.
Developing countries.
Poverty.
Public health--Standards--Statistics.
Harvard subject headings:
Communicable diseases--Control--Statistics.
Developing countries
Poverty
Public health--Standards--Statistics.
Statistics
Princeton subject headings:
Communicable diseases--Control--Statistics.
Developing countries.
Poverty.
Public health--Standards--Statistics.
Statistics.