TY  - RPRT
TI  - Pneumococcal vaccine: time for another controlled trial.
AU  - F Shann
PY  - 1998
DO  - 10.1016/s0140-6736(05)77683-2
UR  - https://pubmed.ncbi.nlm.nih.gov/9620711/
ID  - 9620711
ER  -