Funding for this research was provided by:
National Plan for Science, Technology and Innovation (2016WS0420)
Received: 6 January 2019
Accepted: 17 April 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: This study was approved the institutional ethics committee of Provincial Hospital affiliated to Shandong University. Written informed consent was obtained from each subject.
: Not applicable.
: The authors declare that they have no competing interests.
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