1. Department of Clinical Medicine, Lanzhou University Second Hospital, Lanzhou, Gansu Province, China
2. West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
3. Department of Paediatric Intensive Care Medicine, Lanzhou University Second Hospital, Lanzhou, Gansu Province, China
4. Department of Paediatric Gastroenterology, Lanzhou University Second Hospital, Lanzhou, Gansu Province, China