Tian, Tian
Huang, Rui
Liu, Bin
Article History
Received: 26 February 2019
Accepted: 19 March 2019
First Online: 28 March 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: 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.
: The study was approved by the Institutional Review Board of West China Hospital, Sichuan University and the requirement of written informed consent was waived.