1. Center for Advanced Biomedical Imaging and Photonics Division of Gastroenterology, Department of Medicine Beth Israel Deaconess Medical Center, Harvard University, Cambridge, Massachusetts 02138, United States
2. Center for Advanced Endoscopy Division of Gastroenterology, Department of Medicine Beth Israel Deaconess Medical Center, Harvard University, Cambridge, Massachusetts 02138, United States
3. Department of Pathology Beth Israel Deaconess Medical Center, Harvard University, Cambridge, Massachusetts 02138, United States
4. Biological and Biomedical Sciences Program, Harvard University, Cambridge, Massachusetts 02138, United States