Funding for this research was provided by:
National Natural Science Foundation of China (61272525)
The Fundamental Research Funds for the Central Universities (ZYGX2016J081)
The Laboratory for Internet of Things and Mobile Internet Technology of Jiangsu Province (JSWLSW-2017-006)
Article History
First Online: 17 August 2018
Compliance with ethical standards
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: On behalf of all authors, the corresponding author states that there is no conflict of interest.