Funding for this research was provided by:
Hebei Health and Family Planning Commission (20180725)
Science and Technology Department of Hebei Province (19277761D)
Article History
Received: 19 September 2019
Accepted: 24 January 2020
First Online: 7 February 2020
Compliance with ethical standards
:
: All authors declare no conflicts of interest.
: All procedures performed in studies involving animals 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. This study was approved by the Ethics Committee of the Fourth Hospital of Hebei Medical University (Approval No. 2019MEC050).