1. Mayo Clinic, Department of Radiology, 200 First Street S.W. Rochester, Minnesota 55905, United States
2. Siemens Healthcare, Computed Tomography, Siemensstr. 1, Forchheim 91301, Germany
3. Mayo Clinic, Department of Radiology, 200 First Street S.W. Rochester, Minnesota 55905, United StatescMayo Graduate School, 200 First Street S.W. Rochester, Minnesota 55905, United States
4. Siemens Healthcare, 40 Liberty Boulevard, Malvern, Pennsylvania 19355, United States