1. Department of Virology, Faculty of Medicine, Kagoshima University, Kagoshima 890-8520, Japan
2. First Department of Internal Medicine, Faculty of Medicine, Kagoshima University, Kagoshima 890-8520, Japan
3. Third Department of Internal Medicine, Faculty of Medicine, Kagoshima University, Kagoshima 890-8520, Japan
4. Department of Obstetrics and Gynecology, Faculty of Medicine, Kagoshima University, Kagoshima 890-8520, Japan
5. Kagoshima ATL Study Group, Kagoshima, Japan
6. Division of Epidemiology and Preventive Medicine, Aichi Cancer Center Research Institute, Nagoya 464-0021, Japan