1. Professor, M.E. Rinker, Sr. School of Building Construction, College of Design Construction and Planning, Univ. of Florida, Gainesville, FL 32611-5703 (corresponding author).
2. Rocky Mountain Center for Occupational and Environmental Health, 391 Chipeta Way, Suite C, Univ. of Utah, Salt Lake City, UT 84107.
3. Assistant Professor, M.E. Rinker, Sr. School of Building Construction, College of Design Construction and Planning, Univ. of Florida, Gainesville, FL 32611-5703.