1. Department of Medicine, Stanford University School of Medicine, Stanford, California.
2. Molecular Imaging Program at Stanford, Stanford University School of Medicine, Stanford, California.
3. Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California.
4. Stem Cells and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China.
5. Department of Pathology, Stanford University School of Medicine, Stanford, California.