1. Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
2. Minnesota Dental Research Center for Biomaterials and Biomechanics (MDRCBB), Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
3. Department of Surgical Specialties, College of Dentistry, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States