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Authors
Qiu, Zhaowen
Cao, Huihui
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Funding
Funding for this research was provided by:
the Natural Science Basic Research Plan in Shaanxi Province of China (2017JM7007)
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Article History
Received: 26 June 2019
Accepted: 8 April 2020
First Online: 18 May 2020
Compliance with ethical standards
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: The study was carried according to a protocol approved by Chang’an University, the approval number is 20180517. The objectives of the study were explained to the study participants and all participants signed volunteer consent form.
: The authors declare that they have no conflict of interest.
