Funding for this research was provided by:
Shanghai Municipal Health Bureau project for Youth (20134y161)
Article History
Received: 22 November 2017
Accepted: 8 January 2018
First Online: 18 January 2018
Compliance with ethical standards
:
: Peixia Wu declares that she has no conflict of interest. Zhengrong Peng declares that she has no conflict of interest. Junyi Chen declares that she has no conflict of interest. Yan Hu declares that she has 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.
: Informed consent was obtained from all participants included in this study.