1. WPI-Advanced
Institute for Materials Research, Tohoku University, Sendai 980-8578, Japan
2. Department of Chemistry & Division of Biomedical Engineering, Hong Kong University of Science & Technology, Hong Kong, China
3. Center
for Biomedical Engineering, Department of Medicine, Brigham and Women’s
Hospital, Harvard Medical School; Harvard-MIT Division of Health Sciences
and Technology Massachusetts Institute of Technology; Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts 02115, United States
4. Department
of
Maxillofacial Biomedical Engineering and Institute of Oral Biology,
School of Dentistry, Kyung Hee University, Seoul 130-701, Republic of Korea