1. NIH Center of Biomedical Research Excellence (COBRE) in Stem Cell Biology, Roger Williams Medical Center, Boston University School of Medicine, Providence, Rhode Island, USA
2. Department of Dermatology, Boston University School of Medicine, Boston, Massachusetts, USA
3. Center for Regenerative Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
4. Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
5. Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, California, USA
6. Chengdu Women's & Children's Central Hospital, Chengdu, Sichuan, China