Essien, Samuel Kwaku
Feng, Cindy Xin http://orcid.org/0000-0003-4030-7413
Sun, Wenjie
Farag, Marwa
Li, Longhai
Gao, Yongqing
Article History
Received: 21 March 2018
Accepted: 21 August 2018
First Online: 28 August 2018
Ethics approval and consent to participate
: Ethical approval for collecting data on human subjects was received at Peking University by their institutional review board (IRB). All participants gave their explicit written informed consent before recruited into the study.
: Not applicable.
: The authors declare that they have no competing interests.
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