Wang, Yizhi
Li, Jiarui
Wang, Husheng
Wang, Xipeng
Article History
Received: 29 June 2019
Accepted: 6 April 2020
First Online: 23 April 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Shanghai First Maternity and Infant Hospital, affiliated with Tongji University (KS1512), and was conducted in accordance with the Declaration of Helsinki. All patients signed written informed consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests in this section.