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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