Retraction: Zhao, T., W. Liu, L. Zhang, and W. Zhou. 2018. “Cluster Analysis of Risk Factors from Near-Miss and Accident Reports in Tunneling Excavation.” J. Constr. Eng. Manage. 144 (6): 04018040. https://doi.org/10.1061/(ASCE)CO.1943-7862.0001493. - Retraction Notice | RetractBase