Text and Data Mining valid from 2020-03-10
Received: 15 April 2019
Accepted: 11 February 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the principles of the Declaration of Helsinki and relevant policies in China, and study protocol was reviewed and approved by the Institutional Review Board of Huashan Hospital. Given to the retrospective nature of this study, patients consent for inclusion was waived.
: Not applicable.
: The authors declare that they have no competing interests. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest.