1. Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
2. Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, Florida 32306, United States
3. Department of Bioengineering, University of Washington, Seattle, Washington 98195, United States
4. Department of Materials Science and Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
5. Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, Washington 98195, United States
6. Center for Neurobiology of Addiction, Pain, and Emotion, University of Washington, Seattle, Washington 98195, United States
7. Department of Pharmacology, University of Washington, Seattle, Washington 98195, United States