1. College of Transportation Engineering, Key Laboratory of Road and Traffic Engineering of the State Ministry of Education, Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, 4800 Caoan Highway, Shanghai 201804, China
2. Department of Management Science and Engineering, School of Business, Qingdao University, 62 Keda Branch Road, Laoshan District, Qingdao 266000, China