TY  - RPRT
TI  - Modern vaccines. Practice in developing countries.
AU  - A J Hall
AU  - B M Greenwood
AU  - H Whittle
PY  - 1990
DO  - 10.1016/0140-6736(90)90879-a
UR  - https://pubmed.ncbi.nlm.nih.gov/1969519/
ID  - 1969519
ER  -