TY  - RPRT
TI  - Unexpected control-group behaviour in an intervention study.
AU  - S Anttila
AU  - M Isokoski
PY  - 1985
DO  - 10.1016/s0140-6736(85)90985-7
UR  - https://pubmed.ncbi.nlm.nih.gov/2856961/
ID  - 2856961
ER  -