Lv, Hongyan
Qiao, Baojun
Fang, Liyuan
Yang, Lihong
Wang, Qiuli
Wu, Sujing
Ren, Pengshun
Li, Lianxiang
Article History
Received: 10 August 2019
Accepted: 17 December 2019
First Online: 26 December 2019
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of Handan Maternal and Child Health Care Hospital of Hebei province. Written informed consent was provided by patient’s parents.
: Written informed consent was provided by patient’s parents.
: The authors declare that they have no competing interests.