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American Journal of Epidemiology Copyright © 2004 by the Johns Hopkins Bloomberg School of Public Health All rights reserved Vol. 160, No. 6 Printed in U.S.A.
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Document Date: 2004-09-08 13:13:09
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American Journal of Epidemiology Copyright © 2004 by the Johns Hopkins Bloomberg School of Public Health All rights reserved Vol. 160, No. 6 Printed in U.S.A.