1. Lecturer, School of Management Science and Engineering, Central Univ. of Finance and Economics, Beijing 100081, China.
2. Associate Professor, Dept. of Construction Management, School of Civil Engineering, Tsinghua Univ., Beijing 100084, China (corresponding author).
3. Ph.D. Candidate, Dept. of Construction Management, School of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
4. Associate Professor, School of Management Science and Engineering, Central Univ. of Finance and Economics, Beijing 100081, China.
5. Professor, Dept. of Construction Management, Louisiana State Univ., Baton Rouge, LA 70803.