Fu, Xianzhi
Sun, Nan
Xu, Fei
Li, Jin
Tang, Qixin
He, Junjian
Wang, Dongdong
Sun, Changqing
Funding for this research was provided by:
the National Social Science Foundation of China ((Grant NO: 15BSH043))
Article History
Received: 23 May 2018
Accepted: 10 September 2018
First Online: 15 September 2018
Ethics approval and consent to participate
: The research program was approved by the Zhengzhou University Ethics Committee. All studies are conducted in accordance with the Declaration of Helsinki. Each volunteer participant obtained a written informed consent based on inclusion criteria. Attendees were told that they could withdraw from the study at any time without any consequences and that the anonymity and confidentiality of the study were guaranteed.
: Not applicable.
: The authors declare that they have no competing interest.
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