Funding for this research was provided by:
National Natural Science Foundation of China (81900903)
the Medical and Health Science and Technology Program of Zhejiang Province (2017KY113, 2018KY543)
Received: 20 October 2020
Accepted: 23 November 2020
First Online: 29 December 2020
Ethics approval and consent to participate
: The study complies with the guidelines of the Declaration of Helsinki and was approved by the Ethics Committee of the Staff Hospital of the Jidong Oil-Field of Chinese National Petroleum (China National Petroleum Corporation Jidong Oil-Field Branch Staff Hospital approval document of the medical ethics committee, 2018 YILUNZI 1).
: The authors certify that they have obtained all appropriate participant consent forms. The participants understand that their names and initials will not be published and due efforts will be made to conceal their identity.
: The authors declare that they have no competing interests.