Columbia subject headings:
Harvard subject headings:
Drugs--Research--Tropics.
Medical policy--Developing countries
Pharmaceutical policy--Developing countries.
Schistosomiasis--Brazil.
Tropical medicine--Social aspects.
Princeton subject headings:
Drugs--Research--Tropics.
Medical policy--Developing countries.
Pharmaceutical policy--Developing countries.
Schistosomiasis--Brazil.
Tropical medicine--Social aspects.