TY  - BOOK
AU  - Chang, R S
AU  - Chang,R S
TI  - Preventive health care 
SN  - 0816121656
U1  - 613 
PY  - 1981///
CY  - Boston
PB  - G. K. Hall Medical Publishers
KW  - Preventive medicine
KW  - Community Medicine
ER  -