Predictors of treatment retention and survival among methadone-maintained patients: A possible role for a functional delta opioid receptor gene variant

Variants in the delta opioid receptor gene, OPRD1, were associated with opioid use disorder and response to treatment. The study goal was to assess whether OPRD1 variants predict survival and retention in methadone maintenance treatment (MMT). Retention and survival time since admission (June 1993 -...

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