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Article History

Received: 27 April 2018

Accepted: 12 August 2018

First Online: 18 August 2018

Compliance with ethical standards

:

: Author Min Wu, Yiqing Lv, Hua Xie, Yidong Liu, Weijing Ye, Yichen Huang, and Fang Chen declare that they have no conflict of interest.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained from all individual participants included in the study.