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Authors
Duan, Junya
Wang, Yafei https://orcid.org/0000-0003-1212-6930
Fan, Chen
Xia, Beicheng
de Groot, Rudolf
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Article History
Received: 15 December 2017
Accepted: 11 May 2018
First Online: 28 May 2018
Compliance with Ethical Standards
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: 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.
: Informed consent was obtained from all individual participants included in the study.
