Wang, Jianfei http://orcid.org/0000-0001-9259-1642
Huang, Jiaqi
Guo, Huanyu
Jiang, Shaoming
Zhang, Jing
Ning, Yuchen
Fang, Mudannan
Liu, Shijie
Article History
Received: 17 October 2019
Accepted: 29 January 2020
First Online: 8 February 2020
Compliance with ethical standards
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: The authors declare that they have no potential conflict of interest.
: The contents in this paper are the results of independent research. All data and pictures are authentic and reliable. In addition to the references already indicated in the text, the research results of this paper do not include any content of copyright enjoyed by others. Other individuals and groups contributing to the research work involved in this paper have been clearly identified in this paper. This research does not involve human participants or animals. The publication of the paper has been agreed by the authors and does not involve potential conflicts of interest. I am fully aware of the legal liability of this statement.