1. Postdoctoral Researcher, Dept. of Construction Management and Engineering, Univ. Twente, P.O. Box 217, 7500 AE, Enschede, Netherlands; Assistant Professor, Dept. of Civil Engineering, Erciyes Univ., Melikgazi, Kayseri 38039, Turkey (corresponding author).
2. Associate Professor, Dept. of Construction Management and Engineering, Univ. Twente, P.O. Box 217, 7500 AE, Enschede, Netherlands.