Funding for this research was provided by:
National Natural Science Foundation of China (81272080)
National Natural Science Foundation of China (81000011)
National Natural Science Foundation of China (81000835)
Science and Technological Project of Shenzhen (JCYJ20180305123654620, JCYJ20120613101917373, JC201005280429A)
Natural Science Foundation of Guangdong Province (2016A030313797)
Article History
First Online: 8 January 2020
Compliance with Ethical Standards
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: The authors indicate no potential conflicts of interest.