![](https://www.pdfsearch.io/img/ee1c61a19f7c13a529f2b118adda7f9a.jpg) Date: 2000-10-04 14:31:36
| | © International Epidemiological AssociationInternational Journal of Epidemiology 2000;29:803–806 Printed in Great BritainAdd to Reading ListSource URL: ije.oxfordjournals.orgDownload Document from Source Website File Size: 164,38 KBShare Document on Facebook
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