Article History
Received: 14 October 2017
Accepted: 9 February 2018
First Online: 24 February 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was reviewed and approved by the Internal Review Board of the Renmin Hospital of Wuhan University (No. RHWU10536).
: Informed consents were obtained from all participants in the study.