Funding for this research was provided by:
Fundamental Research Funds for the Central Universities funded by the Ministry of Education of China (JUSRP51710A)
Received: 29 October 2019
Accepted: 19 December 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: This study was performed in agreement with the principles of the Declaration of Helsinki and approved by the ethics committees of Wuxi Fifth People’s Hospital and Rehabilitation Hospital of Huishan District Wuxi City. Written informed consent was obtained from the parent or guardian of each child included in this study.
: Not Applicable.
: The authors declare that they have no competing interests.