1. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
2. College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
3. Central Laboratory of Health Quarantine, Shenzhen International Travel Health Care Center and Shenzhen Academy of Inspection and Quarantine, Shenzhen Customs District, Shenzhen 518033, China
4. School of Informatics, Xiamen University, Xiamen 361005, China