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192![American Journal of Epidemiology Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health All rights reserved American Journal of Epidemiology Copyright © 2000 by The Johns Hopkins University School of Hygiene and Public Health All rights reserved](https://www.pdfsearch.io/img/b3499a9d9f41597906c67c8121494ea6.jpg) | Add to Reading ListSource URL: aje.oxfordjournals.orgLanguage: English - Date: 2001-01-02 20:07:48
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193![American Journal of Epidemiology ª The Author[removed]Published by the Johns Hopkins Bloomberg School of Public Health. American Journal of Epidemiology ª The Author[removed]Published by the Johns Hopkins Bloomberg School of Public Health.](https://www.pdfsearch.io/img/8ec10d37f6223b86b79b9930ac2c2024.jpg) | Add to Reading ListSource URL: aje.oxfordjournals.orgLanguage: English |
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194![American Journal of Epidemiology ª The Author[removed]Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: [removed]. American Journal of Epidemiology ª The Author[removed]Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: [removed].](https://www.pdfsearch.io/img/01fc4cefcbdde9faad16ab268e4261f9.jpg) | Add to Reading ListSource URL: aje.oxfordjournals.orgLanguage: English |
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195![American Journal of Epidemiology Advance Access published November 17, 2008 American Journal of Epidemiology ª The Author[removed]Published by the Johns Hopkins Bloomberg School of Public Health. American Journal of Epidemiology Advance Access published November 17, 2008 American Journal of Epidemiology ª The Author[removed]Published by the Johns Hopkins Bloomberg School of Public Health.](https://www.pdfsearch.io/img/358fcf63f0f35e023198c8b46ce13948.jpg) | Add to Reading ListSource URL: aje.oxfordjournals.orgLanguage: English |
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196![](https://www.pdfsearch.io/img/386e6f96d984ac4cb45e1a2bc72269d6.jpg) | Add to Reading ListSource URL: www.scielosp.org- Date: 2007-03-08 13:49:23
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197![](https://www.pdfsearch.io/img/a3f0002d6d1d1ff915bb53960745ddae.jpg) | Add to Reading ListSource URL: www.councilscienceeditors.orgLanguage: English - Date: 2010-10-13 22:14:36
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198![](https://www.pdfsearch.io/img/12e5411f17ff76509b27ac7c237c6ad3.jpg) | Add to Reading ListSource URL: www.nber.orgLanguage: English - Date: 2001-03-07 09:31:06
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