1. Department of Gastrointestinal Surgery, Shengli Clinical Medical College of Fujian Medical University, Fujian Provincial Hospital, Fuzhou, Fujian Province, China.
2. Clinical Medical Center for Digestive Diseases of Fujian Provincial Hospital, Fuzhou, Fujian Province, China.
3. Department of Gastroenterology, Guangzhou Red Cross Hospital, Jinan University, Guangzhou, Guangdong Province, China.
4. Department of Digestive Endoscopy Center, Shengli Clinical Medical College of Fujian Medical University, Fujian Provincial Hospital, Fuzhou, Fujian Province, China.
5. Department of Gastroenterology, Zhangzhou Municipal Hospital of Fujian Province, Zhangzhou, Fujian Province, China.