Chi, Cheng http://orcid.org/0000-0002-0097-2438
Xue, Yong
Liu, Ruixia
Wang, Yanxin
Lv, Na
Zeng, Huihui
Buys, Nicholas
Zhu, Baoli
Sun, Jing
Yin, Chenghong
Funding for this research was provided by:
Beijing Natural Science Foundation (S160003)
Article History
Received: 15 February 2019
Accepted: 16 May 2019
First Online: 13 June 2019
Compliance with ethical standards
:
: The authors declare that they have no completing interests.
: The study was conducted in accordance with the Declaration of Helsinki, and the protocol was approved by the Ethics Committee of the Beijing Obstetrics and Gynecology Hospital (No. 2017-KY-027-01). Informed written consent was obtained from the parents of each infant.