1. Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China.
2. Associate Professor, Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China.
3. Associate Professor, Dept. of Construction Management, Hainan Univ., Haikou, Hainan 570228, China (corresponding author).
4. Professor, Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China.