Funding for this research was provided by:
Excellent Team of Young Teachers Foundation of Heilongjiang Province (2018-KYYWF-0916)
Heilongjiang Provincial Health and Family Planning Commission on Scientific Research Project (2017-405)
Research Project of Yongchuan Hospital Affiliated to Chongqing Medical University ((YJYJ201902))
Received: 26 July 2019
Accepted: 10 June 2020
First Online: 2 July 2020
Ethics approval and consent to participate
: The experimental protocols were approved by the Ethics Committee of Jiamusi University Clinical Medical College for Research. The committee’s reference number is 2018025. Individual informed consent was waived by the ethics committee listed above because this study used currently existing sample collected during the course of routine medical care and did not pose any additional risks to the patients.
: Not applicable.
: The authors of this study declare no commercial relationships and no conflicts of interest.