Government of the People's Republic of China - Department of Pediatrics, Government of the People's Republic of China - Chinese PLA General Hospital, Department of Pulmonary and Critical Care Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Peking Union Medical College Hospital, Government of the People's Republic of China - Chinese PLA General Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Peking Union Medical College Hospital, Hebei Provincial Children's Hospital- Department of Neurology, Government of the People's Republic of China - Department of Pediatrics, Government of the People's Republic of China - Department of Pediatrics, People's Hospital of Deyang City, Government of the People's Republic of China - Chinese PLA General Hospital, Government of the People's Republic of China - Chinese PLA General Hospital, Binzhou Medical University Hospital- Department of Pediatrics, Shanghai Jiao Tong University (SJTU) - Division of Gastroenterology and Hepatology, Government of the People's Republic of China - Chinese PLA General Hospital, Government of the People's Republic of China - Chinese PLA General Hospital, Capital Medical University, Southern Medical University, Zhujiang Hospital and Linyi People's Hospital- Department of Pediatrics