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Source:
Lancet. 10/19/91, Vol. 338 Issue 8773, p1001. 1/4p.
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Source:
Science. 12/13/1991, Vol. 254 Issue 5038, p1639. 4p. 2 Black and White Photographs, 4 Diagrams, 5 Graphs.
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Source:
Nation. 2/4/1991, Vol. 252 Issue 4, p133-136. 2p.
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Source:
Science. 11/22/1991, Vol. 254 Issue 5035, p1108. 2p.
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Source:
Maclean's. 7/15/91, Vol. 104 Issue 28, p38. 2p. 3 Color Photographs.
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Source:
Science News. 11/16/91, Vol. 140 Issue 20, p308. 2/3p.
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