TY  - RPRT
TI  - Evaluating new vaccines for developing countries. Efficacy or effectiveness?
AU  - J Clemens
AU  - R Brenner
AU  - M Rao
AU  - N Tafari
AU  - C Lowe
PY  - 1996
UR  - https://pubmed.ncbi.nlm.nih.gov/8569019/
ID  - 8569019
ER  -