1. Department of Gastroenterology, Zhujiang Hospital, Southern Medical University , Guangzhou, P. R. China
2. Department of Gastroenterology, Affiliated Dongguan Hospital, Southern Medical University (Dongguan People's Hospital) , Dongguan, P. R. China
3. Department of Gastroenterology, Huizhou First Hospital , Huizhou, P. R. China
4. Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, P. R. China
5. Department of Digestive Diseases, The First People's Hospital of Foshan , Foshan, P. R. China
6. Department of Gastroenterology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University , Guangzhou, P. R. China
7. Department of Gastroenterology, The Third Affiliated Hospital of Guangzhou Medical University , Guangzhou, P. R. China
8. Department of Gastroenterology and Hepatology, Guangzhou Digestive Disease Center, Guangzhou First People's Hospital, School of Medicine, South China University of Technology , Guangzhou, P. R. China
9. Center for Neuroendocrine Tumors, Fudan University Shanghai Cancer Center , Shanghai, P. R. China
10. Department of Head & Neck Tumors and Neuroendocrine Tumors, Fudan University Shanghai Cancer Center , Shanghai, P. R. China