TY  - RPRT
TI  - Randomised trials versus observational studies: is the comparative observational study a poor compromise or a perfect synthesis?
AU  - W Gaus
PY  - 2004
DO  - 10.1159/000080568
UR  - https://pubmed.ncbi.nlm.nih.gov/15353895/
ID  - 15353895
ER  -