1. INTERTEK-PSI 1316 Front Ave NW # 117, Grand Rapids, MI 49504 US e-mail: eduardo.suescun@psiusa.com
2. Dept. of Civil and Urban Engineering, New York Univ. Tandon School of Engineering, 6 Metrotech Center, Rh 411, Brooklyn, NY 11201 US e-mail: iskander@nyu.edu