Funding for this research was provided by:
Natural Science Foundation of Shandong Province (ZR2017LH021)
National key research and development plan (2017YFC0114002)
Shandong medical and health technology development plan (2014WS0188)
Received: 1 August 2018
Accepted: 25 February 2019
First Online: 4 March 2019
Ethics approval and consent to participate
: This study was conducted at the Binzhou Medical University Hospital, and permission was obtained from the hospital’s Ethics Committee. The authors had to obtain patient consent before enrolling participants in this study.
: Not applicable.
: The authors declare that they have no competing interests.
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