1. Division of Substance Dependence, Department of Psychiatry, University of Colorado School of Medicine, Aurora, Colorado, USA.
2. Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado School of Medicine, Aurora, Colorado, USA.
3. Department of Anesthesiology, and University of Colorado School of Medicine, Aurora, Colorado, USA.
4. iC42 Clinical Research and Development, University of Colorado School of Medicine, Aurora, Colorado, USA.