Tian, Yaohua
Xiang, Xiao
Juan, Juan
Song, Jing
Cao, Yaying
Huang, Chao
Li, Man
Hu, Yonghua
Funding for this research was provided by:
Key Project of Natural Science Funds of China (81230066)
National Natural Science Fund Projects of China (81473043)
Article History
Received: 28 November 2017
Accepted: 20 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: The present study is considered exempt from institutional review board approval since the data used was collected for administrative purpose without any personal identifiers.
: Not applicable.
: The authors declare that they have no competing interests.
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