In the above article [Schröder W, Tzschentke TM, Terlinden R, De Vry J, Jahnel T, Christoph T, and Tallarida RJ (2011) J Pharmacol Exp Ther 337:312–320], acknowledgment of funding from the National Institutes of Health National Institute on Drug Abuse [Grant 2P30 DAO13429] was omitted.
The authors regret this error and any inconvenience it may have caused.
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