1. Department of Pharmacology, Pain, and Emotion, School of Medicine, University of Washington, Seattle, Washington, USA.
2. Center for Cannabis Research, Pain, and Emotion, School of Medicine, University of Washington, Seattle, Washington, USA.
3. Center for the Neurobiology of Addiction, Pain, and Emotion, School of Medicine, University of Washington, Seattle, Washington, USA.
4. Peking University School of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.
5. Department of Psychiatry and Behavioral Sciences, School of Medicine, University of Washington, Seattle, Washington, USA.
6. Department of Anesthesiology, School of Medicine, University of Washington, Seattle, Washington, USA.