1 State Key Laboratory of Advanced Optical Communication Systems & Networks, Shanghai Jiao Tong University, Shanghai 200240, China
2 Digestive Endoscopic Center, Shanghai Sixth Hospital, Shanghai Jiao Tong University, Shanghai 200233, China
3 Medical Imaging Institute, Institute of Diagnostic and Interventional Radiology, Shanghai Sixth Hospital, Shanghai Jiao Tong University, Shanghai 200233, China