[1] Univ Iowa, Dept Radiol, Iowa City, IA 52242 USA
[2] Univ Iowa, Dept Internal Med, Iowa City, IA 52242 USA
[3] Univ Iowa, Dept Biostat, Iowa City, IA 52242 USA
[4] Univ Iowa, Holden Comprehens Canc Ctr, Iowa City, IA 52242 USA
[5] Mayo Clin, Dept Radiol, Rochester, MN USA
[6] Ulm Univ Hosp, Div Nucl Med, Ulm, Germany
[7] Univ Nebraska, Med Ctr, Dept Internal Med, Omaha, NE USA
[8] Georgetown Univ Hosp, Dept Internal Med, Washington, DC 20007 USA