1. Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota 55905, United States
2. Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota 55905, United States
3. Department of Cardiovascular Diseases and Center for Regenerative Medicine, Mayo Clinic, Rochester, Minnesota 55905, United States
4. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota 55905, United States