Funding for this research was provided by:
Key Project supported by Medical Science and technology development Foundation, Nanjing Department of Health (YKK17078)
Received: 16 January 2018
Accepted: 4 January 2019
First Online: 8 February 2019
Ethics approval and consent to participate
: The institutional review board at Nanjing Medical University approved this study, which followed the tenets of the Declaration of Helsinki. Written informed consent was obtained from all patients after the nature and possible consequences of the study were explained.
: Not applicable.
: The authors declare that they have no competing interests.
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