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Source:
Lancet. 8/24/1991, Vol. 338 Issue 8765, p469. 3p. 2 Charts, 1 Graph.
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Source:
Lancet. 11/24/2001, Vol. 358 Issue 9295, p1793. 11p. 4 Diagrams, 4 Charts.
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Source:
Lancet. 7/20/2002, Vol. 360 Issue 9328, p224. 1p.
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Source:
Lancet. 9/11/1993, Vol. 342 Issue 8872, p675. 1/9p.
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