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*CDC, 1990, MMWR-MORBID MORTAL W, V39, P11
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*CDC, 1979, SCH IMM REQ
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*CDC, 1997, MMWR-MORBID MORTAL W, V46, P380
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*CDC, 1995, MMWR-MORBID MORTAL W, V44, P177
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*CDC, 1991, MMWR-MORBID MORTAL W, V40, P1
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*CDC PREV, 1995, MMWR-MORBID MORTAL W, V44, P237
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*CDCP, 1997, MMWR-MORBID MORTAL W, V46, P506
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*CDCP, 1996, MMWR-MORBID MORTAL W, V45, P508