1. Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou 350007, P. R. China
2. Department of Pathology, Fujian Medical University Union Hospital, Fuzhou 350001, P. R. China
3. Department of Colorectal Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350001, P. R. China
4. Department of Gastric Surgery, Fujian Medical University Union Hospital, Fuzhou 350001, P. R. China