1. Department of Gastroenterology, Guangzhou Digestive Disease CenterGuangzhou First People's Hospital, Guangzhou Medical University Guangzhou Guangdong Province China
2. Department of GastroenterologyGuangzhou First People's Hospital, School of Medicine, South China University of Technology Guangzhou Guangdong Province China
3. Affiliated Brain Hospital of Guangzhou Medical University Guangzhou Guangdong Province China