Text and Data Mining valid from 2019-07-30
Received: 27 December 2018
Accepted: 15 July 2019
First Online: 30 July 2019
Ethics approval and consent to participate
: The study complied with the Helsinki Declaration for investigation of human subjects. Ethical approval was obtained from the competent Institutional Review Boards of the Lu He hospital and Capital Medical University. All patients provided written informed consent.
: All listed authors have actively participated in the study and have read and approved the submitted manuscript.
: The authors declare that they have no competing interests.