TY  - RPRT
TI  - Meta-analysis: principles and procedures.
AU  - M Egger
AU  - G D Smith
AU  - A N Phillips
PY  - 1997
DO  - 10.1136/bmj.315.7121.1533
UR  - https://pubmed.ncbi.nlm.nih.gov/9432252/
ID  - 9432252
ER  -