Funding for this research was provided by:
National Natural Science Foundation of China (51776101, 51206084)
Natural Science Foundation of Shandong Province (ZR2017MB016)
Project of the State Administration of Work Safety (shandong-0039-2017AQ)
Article History
Received: 28 March 2019
Accepted: 29 November 2019
First Online: 11 December 2019