1. College of Chemical Engineering; Huaqiao University; Xiamen 361021 P. R. China
2. Institute of Biomaterials and Tissue Engineering; Huaqiao University; Xiamen 361021 P. R. China
3. Fujian Provincial Key Laboratory of Biochemical Technology; Xiamen 361021 P. R. China
4. Division of Engineering in Medicine; Department of Medicine; Brigham and Women's Hospital; Harvard Medical School; Cambridge MA 02139 USA
5. Department of Life Science and Institute of Biotechnology; National Dong Hwa University; Hualien 97401 Taiwan