1. Department of Gastroenterology, The General Hospital of Western Theater Command, Chengdu, Sichuan, 610083, China
2. Department of Gastroenterology, Suining Central Hospital, Suining, Sichuan, 629000, China
3. College of Medicine, Southwest Jiaotong University, Chengdu, Sichuan, 610003, China
4. Western Military Command Disease Prevention and Control Center, Chengdu, Sichuan, 610021, China
5. Clinical Research Center, Beijing Children’s Hospital, Capital Medical University, National Center for Children’s Health, Beijing, 100045, China