1. Resident in Laboratory Medicine and Pathology, University of Minnesota, and the Laboratory Service, Veterans Administration Medical Center, Dept. of Laboratory Medicine and Pathology Box 198, UMHC Minneapolis, MN 55455, US.
2. Radiologist, Department of Radiology, University of Minnesota, Minneapolis, MN, US.
3. Radiologist, Radiology Service, Veterans Administration Medical Center, Minneapolis, MN, US.