Funding for this research was provided by:
Natural Science Foundation of Guang Dong Province (2017A030312003)
Health & Medical Collaborative Innovation Project of Guangzhou City, China (201803040003)
Innovation Team Development Plan of the Ministry of Education (IRT_17R110)
Overseas Expertise Introduction Project for Discipline Innovation (B14035)
Received: 11 September 2018
Accepted: 8 January 2019
First Online: 17 January 2019
Ethics approval and consent to participate
: The clinical research ethics committee of Sun Yat-sen University Cancer Center approved this study. As this was a retrospective analysis of routine data, we were granted a waiver for written consent.
: Not applicable.
: The authors declare that they have no competing interests.
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