1. Principal Consultant, POMPLUS Consulting, Ltd., P2001B-C1 Tower, Rung Co., ECOPARK, Hung Yen, Vietnam.
2. Professor, Infrastructure Management, Institute of Construction and Infrastructure Management, Swiss Federal Institute of Technology in Zurich, HIL F 24.3, Stefano-Franscini-Platz 5, 8093 Zürich, Switzerland.
3. Research Associate, Infrastructure Management Group, Institute of Construction and Infrastructure Management, Swiss Federal Institute of Technology in Zurich, HIL F 24.1, Stefano-Franscini-Platz 5, 8093 Zürich, Switzerland (corresponding author).