Funding for this research was provided by:
National Natural Science Foundation of China (81460512)
Received: 1 March 2019
Accepted: 15 May 2019
First Online: 29 May 2019
Ethics approval and consent to participate
: All procedures performed in the current study were approved by the Ethics Committee of Chongqing Cancer Hospital. Written informed consent was obtained from all patients or their families.
: Written informed consents for publication of any associated data and accompanying images were obtained from all patients or their parents, guardians or next of kin.
: The authors declare that they have no competing interests.
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