Text and Data Mining valid from 2020-01-17
Received: 22 August 2019
Accepted: 8 November 2019
First Online: 17 January 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Committee of Honghui Hospital, Xi’an Jiaotong University. All procedures involving human participants were conducted in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. All patients signed informed consent forms prior to the study.
: Not applicable.
: The authors declare that they have no competing interests.