1. Department of Digestive Diseases, Changsha Central Hospital, No. 161 Shaoshan Nanlu, Changsha, Hunan
2. Department of Pathology, Changsha Central Hospital, No. 161 Shaoshan Nanlu, Changsha, Hunan
3. Zhongshan City People Hospital, No. 2, Sunwen East Road, Zhongshan, Guangdong
4. Central Laboratory, Changsha Central Hospital, No. 161 Shaoshan Nanlu, Changsha, Hunan