1. Department of General Surgery, Guangzhou Panyu Center Hospital, Guangzhou, Guangdong Province, China.
2. Department of Electron Microscopy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong Province, China.
3. Department of Electron Microscopy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong Province, China
4. Department of General Surgery, Guangzhou Panyu Center Hospital, Guangzhou, Guangdong Province, China