1. Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, 500 Pillsbury Dr. SE, Minneapolis, Minnesota 55455, United States
2. Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, S.P. Andersens veg 5, 7491 Trondheim, Norway
3. BioTechnology Institute, University of Minnesota, 1479 Gortner Ave., St. Paul, Minnesota 55108, United States