Funding for this research was provided by:
National Natural Science Foundation of China (81172226)
Received: 20 November 2017
Accepted: 30 April 2018
First Online: 22 May 2018
Ethics approval and consent to participate
: The study was conducted in accordance with the Declaration of Helsinki, and the protocol was approved by the Ethic Committee of Xiangya Hospital, Central South University. All of the enrolled lung cancer patients signed informed consent forms.
: The authors declare that they have no competing interests.
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