reproduced by permission of the international journal of
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626 Bulletin of the World Health Organization | August 2004, 82 (8)
Reproduced by permission of the International Journal of Epidemiology
627Bulletin of the World Health Organization | August 2004, 82 (8)
628 Bulletin of the World Health Organization | August 2004, 82 (8)
629Bulletin of the World Health Organization | August 2004, 82 (8)
630 Bulletin of the World Health Organization | August 2004, 82 (8)
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