Genome-wide association study of phenotypes measuring progression from first cocaine or opioid use to dependence reveals novel risk genes by Richard Sherva, Congcong Zhu, Leah Wetherill, Howard J. Edenberg, Emma Johnson, Louisa Degenhardt, Arpana Agrawal, Nicholas G. Martin, Elliot Nelson, Henry R. Kranzler, Joel Gelernter, Lindsay A. Farrer

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