1. Division of Cancer Pharmacology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115
2. Department of Medicine, Medical College of Georgia, Augusta, GA 30912
3. National Cheng Kung University, Department of Physiology, Medical College Tainan, Taiwan 700, R.O.C.
4. Division of Nutritional Sciences, Department of Internal Medicine, College of Medicine, University of Illinois, Urbana, IL 61801