1. Otsuka America Pharmaceutical, Inc., 2440 Research Boulevard, Rockville, Maryland, MD 20850, USA
2. Department of Drug Safety Evaluation, Purdue Pharma L.P. Ardsley, New York, NY 10502, USA
3. Department of Medicine, The Division of Clinical Pharmacology, Georgetown University Medical Center, Washington, DC, USA
4. Kansas City Analytical Services, Shawnee, Kansas, KS 66216, USA
5. Tokushima Research Institute, Otsuka Pharmaceutical Company, Tokushima, Japan