1. State Key Lab of Metal Matrix Composites; Shanghai Jiao Tong University; Shanghai 200240 P. R. China
2. Department of Plastic Surgery; Changhai Hospital; Second Military Medical University; Shanghai 200433 P. R. China
3. Department of Materials Science and Engineering; University of Sheffield; Mappin Street Sheffield S1 3JD UK
4. Michigan Nanotechnology Institute for Medicine and Biological Sciences; Department of Internal Medicine; University of Michigan; Ann Arbor MI 48109 USA
5. Department of Plastic and Reconstructive Surgery; Shanghai 9th People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Tissue Engineering; Shanghai Stem Cell Institute; Shanghai 200241 P. R. China