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24Published 1987“...OCS study....”
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30Published 1988“...OCS study....”
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33Published 1988“...OCS study....”
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35Published 1989“...OCS study....”
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38Published 1988“...OCS study....”
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39Published 1990“...OCS study....”
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40Published 1990“...OCS study....”
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