Operational research in low-income countries.
Horstick
Olaf
O
Sommerfeld
Johannes
J
Kroeger
Axel
A
Ridley
Robert
R
D035843:Biomedical Research / Q000191:economics / Q000379:methods; D003140:Communicable Disease Control / Q000191:economics* / Q000379:methods*; D003906:Developing Countries; D006801:Humans