Zhang, Tao
Liu, Chaojie
Liu, Lingrui
Gan, Yong
Lu, Wei
Tao, Hongbing
Article History
Received: 5 November 2018
Accepted: 22 April 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: Our study was approved by the ethics committee of Hangzhou Normal University.
: Consent for publication was obtained from persons we investigated in this study.
: The authors declare that they have no competing interests.
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