TY  - RPRT
TI  - Sub-group analyses: to do or not to do?
AU  - François Gueyffier
PY  - 2004
DO  - 10.1097/00004872-200403000-00007
UR  - https://pubmed.ncbi.nlm.nih.gov/15076150/
ID  - 15076150
ER  -