1. Regenerative Medicine Laboratory, Stem Cell Research Center, Department of Biomedical Science and Technology, SMART Institute of Advanced Biomedical Science, Konkuk University, 143-701 Seoul, Republic of Korea
2. Department of Chemical and Biological Engineering, Chalmers University of Technology, SE 412 96 Gothenburg, Sweden
3. Department of Orthopedic Surgery, Yonsei Sarang Hospital, 137-820 Seoul, Republic of Korea