TY  - RPRT
TI  - Choosing between randomised and non-randomised studies: a systematic review.
AU  - A Britton
AU  - M McKee
AU  - N Black
AU  - K McPherson
AU  - C Sanderson
AU  - C Bain
PY  - 1998
UR  - https://pubmed.ncbi.nlm.nih.gov/9793791/
ID  - 9793791
ER  -