Funding for this research was provided by:
Key research and development project of Anhui Province, China (1704a0802172)
Article History
Received: 4 March 2019
Accepted: 3 July 2019
First Online: 9 July 2019
Ethics approval and consent to participate
: This study was exempted from obtaining informed consent by the Ethics Committee of Anhui Provincial Children’s Hospital, Hefei, China with the ethical approval number of EYLL-2018-03.
: Not applicable.
: The authors declare that they have no competing interests.