Wei, Wenbo
Dang, Shajie
Duan, Dapeng
Wei, Ling
Article History
Received: 6 November 2017
Accepted: 31 May 2018
First Online: 13 June 2018
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Shaanxi provincial people Hospital ((the ethics approval number provided by the board was 2,009,125)), and written informed consent was obtained from all study participants.
: The authors declare that they have no competing interests.
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