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Center undefined(1991)undefined MMWR Morb Mortal Wkly Rep 40 513-undefined
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Center undefined(1992)undefined MMWR Morb Mortal Wkly Rep 41 1-undefined
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Lewis undefined(1998)undefined Ann Pharmacother 32 802-undefined
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Lewis undefined(1998)undefined Ann Pharmacother 32 1087-undefined
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Shaw undefined(1996)undefined JAMA 275 1093-undefined
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Werler undefined(1996)undefined JAMA 275 1089-undefined