Received: 9 November 2018
Accepted: 13 February 2019
First Online: 22 February 2019
Ethics approval and consent to participate
: This study was permitted by the Ethics Committee of Tianjin Huanhu Hospital, Tianjin, P. R. China on January 9th in 2017 (approval number: C2017A0116).
: Not applicable.
: The authors declare that they have no competing interests.
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