Cui, Xiaoqing
Zhao, Hong
Li, Zengxi
Funding for this research was provided by:
National Natural Science Foundation of China (21676270)
NSFC-Key Projects of Shanxi Coal Based Low Carbon Joint Foundation (U1610222)
Article History
Received: 7 July 2018
Revised: 31 August 2018
Accepted: 10 September 2018
First Online: 11 October 2018
Compliance with ethical standards
: The study was approved by the Health Center of the University of Chinese Academy of Sciences and was performed in accordance with the ethical standards. Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.