1. Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
2. Shenzhen People's Hospital, Shenzhen, China
3. Southern Medical University, Guangzhou, China
4. State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
5. Department of Hepatobiliary Surgery, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China