1. Department of Radiology, Cleveland Clinic, 9500 Euclid Ave, Cleveland, OH 44195.
2. Brooke Army Medical Center, Fort Sam Houston, TX.
3. The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins School of Medicine, Baltimore, MD.
4. The Royal Marsden Hospital and The Institute of Cancer Research, London, UK.
5. School of Medicine, National and Kapodistrian University of Athens Areteion Hospital, Athens, Greece.
6. University of Maryland School of Medicine, Baltimore, MD.