Funding for this research was provided by:
Dean's Fund of Tianjin Nankai Hospital (20140385)
Received: 30 November 2017
Accepted: 9 March 2018
First Online: 20 March 2018
Ethics approval and consent to participate
: The protocol of this study was approved by the Research Ethics Committee of Tianjin Nankai Hospital, China. Written informed consent was obtained from all patients participated in this study
: All authors have no potential conflicts of interest.
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