1. Civil and Environmental Engineering, University of Michigan, 1351 Beal Ave., Ann Arbor, Michigan 48109-2138, United States
2. Civil and Environmental Engineering, Duke University, Durham, North Carolina, 27708, United States
3. Department of Internal Medicine, University of Michigan Medical School, NCRC Bldg. 16 #471C, 2800 Plymouth Rd., Ann Arbor, Michigan 48109-2138, United States