1. Roy J. Carver Department of Biomedical Engineering, College of Engineering, University of Iowa, Iowa City, IA 52242, USA
2. Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
3. Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
4. University of Iowa Fraternal Order of Eagles Diabetes Research Center, Iowa City 52242, IA, USA