Funding for this research was provided by:
National Natural Science Foundation of China (81802508, 81702161, 81903398)
Natural Science Foundation of Tianjin Municipal Science and Technology Commission (17JCQNJC11000)
Text and Data Mining valid from 2019-10-25
Received: 26 February 2019
Accepted: 16 September 2019
First Online: 25 October 2019
Ethics approval and consent to participate
: This study used previously collected, deidentified data, which were deemed exempt from review by the Ethics Board of the Tianjin Medical University Cancer Institute and Hospital.
: Not applicable.
: The authors declare that they have no competing interests.