TY  - RPRT
TI  - Collaborative worldwide overviews of randomized trials.
AU  - P Sandercock
PY  - 1993
DO  - 10.1111/j.1749-6632.1993.tb26344.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8192292/
ID  - 8192292
ER  -