Funding for this research was provided by:
National Natural Science Foundation of China (81672896)
Young Scientists Fund (81602071)
Innovation Fund for Outstanding Doctoral Candidates of Peking University Health Science (71013Y2029)
Text and Data Mining valid from 2020-01-10
Received: 30 July 2019
Accepted: 12 November 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Nanjing Medical University (Nanjing, Jiangsu, China) and implemented in accordance with the Helsinki Declaration of Principles.
: All the authors agree to publish this paper.
: The authors declare that they have no competing interests.