Funding for this research was provided by:
China Medical Board (15-219)
Article History
Received: 28 February 2018
Accepted: 3 March 2019
First Online: 12 March 2019
Ethics approval and consent to participate
: Ethics approval was obtained by Shengjing Hospital of China Medical University Ethics Committee (ref. Ethics 2017PS42K) without requirement of consent for participation.
: Not applicable.
: All authors declare that they have no conflicts of interests.
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