作者: Charlotte H. S. B. van den Berg , Colette Smit , Margreet Bakker , Ronald B. Geskus , Ben Berkhout
DOI: 10.1007/S10654-006-9089-7
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摘要: … a sharp decline in the past two decades, similar to the decline in … in a methadone program or from the use of NEP, these … to the decline in risk behavior related to drug use at the …