1. School of Highway, Chang’an University, Xi’an, People’s Republic of China
2. Shandong Hi-Speed Group Co., Ltd, Ji’nan, People’s Republic of China
3. Shandong Hi-Speed Transportation Construction Group Co., Ltd., Jinan, People’s Republic of China
4. Shandong Hi-Speed Company Limited, Jinan, People’s Republic of China
5. College of Transportation Engineering, Chang’an University, Xi’an, People’s Republic of China