1. Interdisciplinary Program for Bioengineering; Graduate School; Seoul National University; Seoul 110-744 Korea
2. Department of Dermatology; Seoul National University Hospital; Seoul 110-744 Korea
3. Department of Biomedical Engineering; Seoul National University Hospital; Seoul 110-744 Korea
4. Department of Biomedical Engineering; Seoul National University College of Medicine; Seoul 110-799 Korea
5. Institute of Medical and Biological Engineering; Seoul National University; Seoul 151-742 Korea