1. Present address: Department of Clinical Pharmacology and Therapeutics, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama, Yufu-shi, Oita 879-5593, Japan
2. Clinical Pharmacology Center, Oita University Hospital, 1-1 Idaigaoka, Hasama, Yufu-shi, Oita 879-5593, Japan