1. Department of Anesthesia, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, Iowa City, IA
2. Department of Biomedical Engineering, University of Iowa, 5601 Seamans Center for the Engineering Arts and Sciences, Iowa City, IA
3. Auckland Bioengineering Institute, University of Auckland, 6/70 Symonds St, Grafton, Auckland 1010, New Zealand
4. Department of Radiology, University of Iowa Hospitals and Clinics, 3970 John Pappajohn Pavilion, 200 Hawkins Dr, Iowa City, IA