1. School of Public Health, North China University of Science and Technology, No.21 Bohai Avenue, 063210, Tangshan, Hebei Province, Peoples’ Republic of China.
2. Department of medical engineering, Air Force Medical Center, PLA, Beijing, 100142, China.
3. Infectious Disease Prevention and Control Department, Jining Center For Disease Control And Prevention, No.26 Yingcui Road, 272000, Jining, Shandong Province, Peoples’ Republic of China.
4. Weifang Nursing Vocational College, 262500, Weifang, Shandong Province, Peoples’ Republic of China.