1. School of Interdisciplinary Bioscience and Bioengineering
2. Department of Mechanical Engineering
3. Department of Bioengineering, University of Pennsylvania, 435 Skirkanich Hall, 210 South 33rd Street, Philadelphia, Pennsylvania 19104
4. Biomonitoring Research Center, Korea Research Institute of Bioscience & Biotechnology, Daejeon 305-806, Korea