Li, Wei
Kondracki, Anthony
Gautam, Prem
Rahman, Abir
Kiplagat, Sandra
Liu, Houqin
Sun, Wenjie
Article History
Received: 2 June 2020
Revised: 30 September 2020
Accepted: 5 October 2020
First Online: 16 October 2020
Compliance with ethical standards
: 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 recruitment into the study.
: The authors declare that they have no competing interests.