Funding for this research was provided by:
Natural Science Foundation of Hunan Province (2017JJ3478)
National Natural Science Foundation of China (81702068)
Text and Data Mining valid from 2019-09-18
Received: 23 June 2019
Accepted: 9 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Central South University (Changsha, Hunan Province, China). All procedures performed in studies involving human participants were in accordance with the ethics standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethics standards. Written informed consent was obtained from all individual participants included in this study.
: Not applicable.
: The authors declare that they have no competing interests.