TY  - RPRT
TI  - Primary prevention: aspects of program design and evaluation.
AU  - D R Offord
PY  - 1982
DO  - 10.1016/s0002-7138(09)60874-8
UR  - https://pubmed.ncbi.nlm.nih.gov/7096839/
ID  - 7096839
ER  -