1 State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, Guangdong, China.
2 Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
3 Department of Gastroenterology and Hepatology, Inner Mongolia People's Hospital, Hohhot, Inner Mongolia Autonomous Region, China.