International Journal of Epidemiology © International Epidemiological Association 1989 Vol. 18, No. 1 Printed in Great Britain

First Page		Document Content
Date: 2011-06-02 14:39:56		International Journal of Epidemiology © International Epidemiological Association 1989 Vol. 18, No. 1 Printed in Great Britain Add to Reading List Source URL: www.epidemiology.ch Download Document from Source Website File Size: 511,00 KB Share Document on Facebook