Funding for this research was provided by:
Health and Family Planning Commission of Sichuan Province (ZH2018-102)
Sichuan Medical Association (S17054)
Article History
Received: 4 July 2018
Accepted: 18 September 2018
First Online: 26 September 2018
Compliance with ethical standards
:
: None of the authors has any conflict of interest related to this work.
: All procedures performed in this study 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 article does not contain any study with animals performed by any of the authors.
: Informed consent was obtained from all the participants in this study or their legal proxies.