Funding for this research was provided by:
Science and Technology Program of Guangzhou (201704020217)
Received: 14 March 2020
Accepted: 30 June 2020
First Online: 15 July 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.
: None declared.