Sun, Jing
Yan, Xuetao
Yuan, Aiwu
Huang, Xiaolei
Xiao, Yuci
Zou, Liwei
Liu, Danyong
Huang, Ting
Zheng, Zhao
Li, Yuantao
Article History
Received: 19 August 2019
Accepted: 28 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The study was approved by the human research committee of Affiliated Shenzhen Maternity & Child Healthcare Hospital, Bao’an Maternal and Child Health Hospital, and Longgang District Maternity & Child Healthcare Hospital of Shenzhen City. Written informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they no competing interests.