reproduced by permission of the international journal of

5
626 Bulletin of the World Health Organization | August 2004, 82 (8) Reproduced by permission of the International Journal of Epidemiology

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Page 1: Reproduced by permission of the International Journal of

626 Bulletin of the World Health Organization | August 2004, 82 (8)

Reproduced by permission of the International Journal of Epidemiology

Page 2: Reproduced by permission of the International Journal of

627Bulletin of the World Health Organization | August 2004, 82 (8)

Page 3: Reproduced by permission of the International Journal of

628 Bulletin of the World Health Organization | August 2004, 82 (8)

Page 4: Reproduced by permission of the International Journal of

629Bulletin of the World Health Organization | August 2004, 82 (8)

Page 5: Reproduced by permission of the International Journal of

630 Bulletin of the World Health Organization | August 2004, 82 (8)