Funding for this research was provided by:
National Natural Science Foundation of China (81071420, 81270365)
Received: 15 June 2017
Accepted: 9 January 2018
First Online: 23 January 2018
Ethics approval and consent to participate
: This case-control study was approved by the Medical Ethics Committee of Zhongnan Hospital of Wuhan University (approval number 2010052), and written informed consents were obtained from all participants prior to enter the study.
: Publish consents were obtained from all participants prior to enter the study.
: The authors declare that they have no competing interests.
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