The Challenge of Epidemiology
There were 968 employees satisfying these criteria, from whom a stratified random sample of 390 individuals was drawn ... a certificate from their family doctor upon return to work and submit to an examination by the in-plant medical service.
| Title | : | The Challenge of Epidemiology |
| Author | : | Carol Buck |
| Publisher | : | Pan American Health Org - 1988 |
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