1. Division of Nutritional Sciences, University of Illinois, Urbana, IL 61801
2. Division of Medical Oncology, Department of Medicine, and the Comprehensive Cancer Center, The Ohio State University, Columbus, OH, 43210
3. Department of Pharmacology, Case Western Reserve University, Cleveland, OH 44106
4. Department of Human Nutrition and Health, DSM Nutritional Products, Kaiseraugst 4303, Switzerland