1Department of Gastroenterology and Hepatology, West China Hospital, Sichuan University, Chengdu, China;

2Department of Gastroenterology, Armed Police Forces Hospital of Sichuan, Leshan, China.

Correspondence: Bing Hu, MD. E-mail: [email protected]. Liansong Ye, MD. E-mail: [email protected].

*Liuxiang Chen, Ruilan Wang, and Tingfa Peng are co-first authors.