Ethics approval and consent to participate
The Ethics committee of the First Affiliated Hospital of Soochow University approved the study. We have obtained a written and signed consent to publish this paper from these patients.
Acknowledgements
The authors would like to thank Michael Chen (University of Pennsylvania College of Arts and Sciences, Philadelphia, PA 19104) for critical review of the manuscript. This study was supported by research funding from Six Talent Peaks Project in Jiangsu Province (WSN 020).
Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at http://dx.doi.org/10.1080/10428194.2017.1317096.