1. Cardiovascular and Gastroenterological Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima 890-8520, Japan
2. Department of Laboratory and Vascular Medicine, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima 890-8520, Japan
3. Department of Surgery, Kirishima Medical Center, Kirishima 899-5112, Japan
4. Department of Surgery, Kagoshima Medical Center, National Hospital Organization, Kagoshima 892-0853, Japan