TY  - RPRT
TI  - Methodological considerations in case-control studies to evaluate BCG vaccine effectiveness.
AU  - V Wünsch-Filho
AU  - J E Moncau
AU  - N Nakao
PY  - 1993
DO  - 10.1093/ije/22.1.149
UR  - https://pubmed.ncbi.nlm.nih.gov/8449636/
ID  - 8449636
ER  -