- Received October 23, 2011, and in revised form January 18, 2012.
- Accepted for publication January 19, 2012.
- Reprints: Shenghan Lai, MD, MPH, Johns Hopkins School of Medicine, 600 N Wolfe St, Pathology #301, Baltimore, MD 21287. E-mail: .
- The study was supported by grants from the National Institute on Drug Abuse, National Institutes of Health (NIH R01DA 12777, DA15020, and DA25524).
- First published December 15, 2015.
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