TY  - BOOK
AU  - Abramson,J.H.
TI  - Survey methods in community medicine: epidemiological studies programme evaluation clinical trials 
SN  - 4430419602
PY  - 1990///
CY  - Edinburgh
PB  - Churchill Livingstone
KW  - Clinical trials
KW  - Trends
KW  - Community medicine
ER  -