Funding for this research was provided by:
National Nature Science Fundation of China (81502535)
Received: 16 July 2017
Accepted: 15 February 2018
First Online: 23 February 2018
Ethics approval and consent to participate
: This study was approved by the Nanfang Hospital Ethics Review Board with the consent of each patient.
: Not applicable.
: The authors declare that they have no competing interests.
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