Funding for this research was provided by:
Health Department of Sichuan Province (130114)
Nature Science Foundation of China (81401238)
Article History
Received: 25 July 2017
Revised: 8 January 2018
Accepted: 1 February 2018
First Online: 7 March 2018
Compliance with ethical guidelines
:
: L. Xie, X. Lv, Y. Sun, Y. Tong, S. Zhang, and Y. Deng declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all participants and the study was approved by the Ethics Committee of Sichuan University.