1. Discovery Research Laboratories, Kyorin Pharmaceutical Co. Ltd., 2399-1, Nogi, Nogi-Machi, Shimotsuga-Gun, Tochigi 329-0114, Japan
2. Bristol-Myers Squibb Research and Development, P.O. Box 5400, Princeton, New Jersey 08534, United States
3. Department of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States