1. University of Pennsylvania School of Veterinary Medicine, Department of Clinical Studies, Philadelphia, Pennsylvania 19104, United States
2. University of Pennsylvania, Department of Physics and Astronomy, Philadelphia, Pennsylvania 19104, United States
3. University of Pennsylvania School of Medicine, Department of Surgery, Philadelphia, Pennsylvania 19104, United States
4. University of Pennsylvania School of Medicine, Department of Pathology, Philadelphia, Pennsylvania 19104, United States
5. University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania 19104, United States
6. Emory University, Departments of Biomedical Engineering and Chemistry, Atlanta, Georgia 30322, United States