Text and Data Mining valid from 2019-01-08
Received: 30 November 2018
Accepted: 25 December 2018
First Online: 8 January 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: The study was approved by the Ethical Committee of Fudan University Shanghai Cancer Center.
: Informed consent was obtained from all individual participants included in the study.