1. Department of Neural and Pain Sciences, University of Maryland, Baltimore School of Dentistry, Baltimore, Maryland;
2. Department of Anesthesiology, University of Pittsburgh, Pittsburgh, Pennsylvania;
3. Department of Neurobiology, University of Pittsburgh, Pittsburgh, Pennsylvania;
4. Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;
5. Center for Neuroscience at the University of Pittsburgh, Pittsburgh, Pennsylvania; and
6. Pittsburgh Center for Pain Research, University of Pittsburgh, Pittsburgh, Pennsylvania