1. Vascular Biology Program, Children's Hospital, Harvard Medical School, Boston, Massachusetts.
2. Department of Biomedical Engineering, Columbia University, New York, New York.
3. Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio.
4. Departments of Anesthesia and Biomedical Engineering, Yale University, New Haven, Connecticut.
5. Departments of Orthopedic Surgery, Molecular Genetics, and Biochemistry and Bioengineering, University of Pittsburgh, School of Medicine, Stem Cell Research Center, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania.
6. College of Dental Medicine, Columbia University, New York, New York.
7. Departments of Mechanical Engineering, Materials Science Engineering, and Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.
8. Department of Biomedical Engineering, Tufts University, Medford, Massachusetts.