(Q51706372)
Statements
Changes over time in heroin and cocaine use among injecting drug users in Amsterdam, The Netherlands, 1985-1989. (English)
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Coutinho RA
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Hartgers C
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Van den Hoek A
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Krijnen P
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Van Brussel GH
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1 September 1991
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86
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9
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1091-1097
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