Funding for this research was provided by:
Shandong Medicine and Health Science Technology Development Project (No. 2017WS849; No. 2017WS777)
Received: 17 December 2019
Accepted: 5 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: The experimental procedures of the current study were proved by the Ethics Committee of Affiliated Hospital of Weifang Medical University. The informed consent for the sample collection and application was signed by each participant.
: Written informed consent for publication was obtained from each participant.
: The authors declare that they have no competing interests.