TY  - RPRT
TI  - Introducing new vaccines into developing countries: obstacles, opportunities and complexities.
AU  - John Clemens
AU  - Luis Jodar
PY  - 2005
DO  - 10.1038/nm1225
UR  - https://pubmed.ncbi.nlm.nih.gov/15812482/
ID  - 15812482
ER  -