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1Published 1990Subjects “...Contraceptives Research United States....”
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2Published 2001Subjects “...Drugs Research Statistical methods....”
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3by Witt, ClaudiaSubjects “...Alternative medicine Research Handbooks, manuals, etc....”
Published 2010
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4
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5Published 1994Subjects “...Pediatrics Research Moral and ethical aspects....”
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6
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7
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8