Funding for this research was provided by:
Science and Technology Commission of Shanghai Municipality (18411951700)
Intelligent Medical Research Project of Shanghai Health and Family Planning Commission (2018ZHYL0225)
Text and Data Mining valid from 2020-03-12
Received: 3 December 2019
Accepted: 25 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: Ethics approval was obtained from the Children’s Hospital of Fudan University Ethics Committee (No. 2019–188). Due to the retrospective study, it is not needed to obtain consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.