Huazhong University of Science and Technology - Department of Paediatrics, Government of the People's Republic of China - Department of Pediatrics, Guangzhou Medical University - Guangzhou Institute of Pediatrics, Guangzhou Medical University - Department of Pediatrics, Huazhong University of Science and Technology - Department of Paediatrics, Third People's Hospital of Shenzhen - Department of Infectious Disease, Southern University of Science and Technology - Department of Pediatrics, Guangzhou Medical University - Clinical Data Center, Guangzhou Medical University - Clinical Data Center, Guangzhou Medical University - Clinical Data Center, Guangzhou Medical University - Clinical Data Center, Guangzhou Medical University - Clinical Data Center, Guangzhou Medical University - Department of Pediatrics, Guangzhou Medical University - Department of Pediatrics, Guangzhou Medical University - Department of Pediatrics, Southern University of Science and Technology - Department of Pediatrics, Guangzhou Medical University - Department of Gastroenterology, Guangzhou Medical University - Guangzhou Institute of Pediatrics, Huazhong University of Science and Technology - Wuhan Children’s Hospital, Southern University of Science and Technology - Pulmonary Diseases Department Two and Guangzhou Medical University - Guangzhou Women and Children's Medical Center