1 Department of Pediatrics, Peking University First Hospital, No. 1, Xi'an-men Street, West District, Beijing, 100034, China.
2 Research Unit of Clinical Diagnosis and Treatment of Pediatric Syncope and Cardiovascular Diseases, Chinese Academy of Medical Sciences, Beijing, China.
3 Department of Pediatrics, Peking University First Hospital, No. 1, Xi'an-men Street, West District, Beijing, 100034, China. jinhongfang51@126.com.
4 Research Unit of Clinical Diagnosis and Treatment of Pediatric Syncope and Cardiovascular Diseases, Chinese Academy of Medical Sciences, Beijing, China. jinhongfang51@126.com.
5 Key Laboratory Molecular Cardiovascular Science, the Ministry of Education, Peking University, Beijing, China.