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Article History
Received: 5 June 2018
Accepted: 17 June 2019
First Online: 29 June 2019
Compliance with ethical standards
:
: All authors declare that they have no conflicts 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. This study was approved by Ethics Committee of West China Hospital, Sichuan University.