1. Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510006, China
2. Digestive Endoscopy Center, Jiangsu Province Hospital, the First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu 210029, China
3. Materials Science and Engineering Program, University of California, San Diego, California 92093, United States
4. Center for Nanomedicine and Department of Anesthesiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States