Zhong, Yang
Zhang, Xingyu
Zhou, Lijun
Li, Lei
Zhang, Tao
Article History
Received: 29 December 2020
Accepted: 9 April 2021
First Online: 30 April 2021
Declarations
:
: The analysis of pediatric clinical trials registered in ExternalRef removed was not considered human subject research. No administrative permission was needed to assess the data.
: Not applicable.
: The authors have read and understood BMC Pediatrics policy on declaration of interests and declare that they have no competing interests.