Funding for this research was provided by:
National Natural Science Foundation of China (81701627)
The Public Welfare Scientific Research Project of China (201402012)
Text and Data Mining valid from 2019-11-21
Received: 15 March 2019
Revised: 7 September 2019
Accepted: 21 October 2019
First Online: 21 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Informed consent was obtained at diagnosis from all individual participants included in the study.
: All procedures performed in studies involving human materials were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.