1. Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan.
2. Center for Stem Cell Research, Taipei Medical University-Wan Fang Hospital, Taipei, Taiwan.
3. Department of Ophthalmology, Taipei Medical University-Wan Fang Hospital, Taipei, Taiwan.
4. Stem Cell Research Center, National Yang-Ming University, Taipei, Taiwan.
5. Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan.
6. Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.