Funding for this research was provided by:
the National Nature Foundation of China (81672184)
Peak Talents Foundation in Jiangsu Province (2015-WSN-065)
the Key Program of Science and Technique Development Foundation in Jiangsu Province (BE2016642)
Text and Data Mining valid from 2018-08-16
Received: 8 January 2018
Accepted: 1 August 2018
First Online: 16 August 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Affiliated Hospital of Xuzhou Medical University and in accordance with the standards of the National Research Council. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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