1. Medical Foundation of Buffalo, Inc., Buffalo, NY 14203
2. School of Pharmacy, Oregon State University, Corvallis, OR 97331
3. Cardiovascular Division, Department of Medicine, Veterans Administration Medical Center, Minneapolis, MN 55417, and University of Minnesota, Minneapolis, MN 55455
4. Toxicology Research Laboratory, Veterans Administration Medical Center, Minneapolis, MN 55417, and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455