Text and Data Mining valid from 2020-02-04
Received: 3 August 2019
Accepted: 23 January 2020
First Online: 4 February 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of the Hunan provincial peoples Hospital (The IRB of Hunan Provincial People’s Hospital No:(L)2018–38) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.