1. Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland School of Dentistry, Baltimore, MD, USA;
2. Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, MD, USA;
3. Program in Neuroscience, University of Maryland, Baltimore, MD, USA;
4. Department of Psychology, University of Maryland, Baltimore County, Baltimore, MD, USA;
5. Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, MD, USA