Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2016A030313817)
Science and Technology Program of Guangzhou, China (201704020217)
Received: 28 March 2020
Accepted: 24 September 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Guangdong Women and Children Hospital and has been performed in accordance with the principles of Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.