Wang, Huanyu
Zhang, Liping
Wang, Hong
Nan, Yang
Ma, Quanfeng
Funding for this research was provided by:
National Science Foundation of Tianjin City, China (18JCZDJC98600)
Health and Family Planning Commission in Binhai New District of Tianjin City, China (018BWKZ003)
Article History
Received: 10 May 2020
Accepted: 29 June 2020
First Online: 7 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.