Funding for this research was provided by:
National Natural Science Foundation of China (81472317)
Natural Science Foundation of Guangdong Province of China (2016A020215232)
CSCO Merck Serono Oncology Research Fund (Y-MX2014-048)
Received: 23 November 2017
Accepted: 27 February 2018
First Online: 6 March 2018
: The authors declare that they have no competing interests.
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