Funding for this research was provided by:
Young Scientists Fund (No. 81700695)
China Scholarship Council (201909370036)
Received: 18 September 2019
Accepted: 6 July 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: The present study was approved by Medical Ethics Committee of Affiliated Yantai Yu-huangding Hospital of Qingdao University Medical and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare that they have no competing interests.