CONTACT US: Contact info
|
Citation |
Christoffel TH, Christoffel KK. Am. J. Public Health 1987; 77(6): 735-738. |
|
Copyright |
(Copyright © 1987, American Public Health Association) |
|
DOI |
unavailable |
PMID |
3578624 |
|
PMCID |
|
|
Abstract |
unavailable. |