Text and Data Mining valid from 2019-10-10
Received: 4 July 2019
Accepted: 5 September 2019
First Online: 10 October 2019
Ethics approval and consent to participate
: This project was approved by the Ethical Committee of Sun Yat-Sen University Cancer Center and informed consent was obtained from all patients.
: All authors gave their consent for publication.
: The authors declare that they have no competing interests.