1. Tianjin University of Traditional Chinese Medicine; Tianjin 300193 China
2. Tianjin International Joint Academy of Biomedicine; Tianjin 300457 China
3. Inst. of Biomedical Engineering; University of Oxford; Oxford OX3 7DQ U.K
4. Tianjin Weikai Bioeng Ltd.; Tianjin 300457 China
5. Dept. of Chemical Engineering; Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology; Dalian 116024 China
6. Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University; Dalian 116011 China