1. Behavioral Pharmacology Research Unit, Johns Hopkins University School of Medicine, 5510 Nathan Shock Dr., Baltimore, MD, USA
2. RTI International, Research Triangle Park, 3040 East Cornwallis Rd., NC, USA
3. Substance Abuse and Mental Health Services Administration (SAMHSA), Division of Workplace Programs (DWP), 5600 Fishers Lane, Rockville, MD, USA