Article History
Received: 5 July 2018
Accepted: 26 September 2018
First Online: 22 October 2018
Compliance with ethical standards
:
: We declare that we have no competing interests that might have influenced the performance or presentation of the work described in this report.
: This study was performed in accordance with the Declaration of Helsinki and was approved by the Research Ethics Committee of Xi’an Jiaotong University, China.