TY  - RPRT
TI  - Preventive clinical trials. An overview.
AU  - P Greenwald
PY  - 1995
DO  - 10.1111/j.1749-6632.1995.tb12116.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8526342/
ID  - 8526342
ER  -