Yang, Chen
Cheng, Yan
Hu, Jianying
Lu, Yaojun
Yu, Xinhua
Huang, Shaoqiang
Article History
Received: 20 August 2021
Accepted: 24 June 2022
First Online: 11 July 2022
Declarations
:
: This study was approved by the China Ethics Committee of Registering Clinical Trials (ChiECRCT20200030), and written informed consent was obtained from all the primiparas in the trial. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.