1. Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
2. Department of Surgery-General Surgery, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
3. Department of Neurological Sciences and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
4. Department of Surgery-Cardiothoracic Surgery, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
5. Department of Cardiovascular Diseases, Physiology and Biomedical Engineering, Center of Regenerative Medicine, Mayo Clinic, Scottsdale, Arizona 85259, United States
6. Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States