1. Department of Cardiovascular Surgery, Chiba-Nishi General Hospital, Matsudo-Shi, Chiba-Ken, Japan
2. Department of Radiological Technologist, Chiba-Nishi General Hospital, Matsudo-Shi, Chiba-Ken, Japan
3. Department of Gastroenterology, Chiba-Nishi General Hospital, Matsudo-Shi, Chiba-Ken, Japan
4. Department of Cardiology, Narita Tomisato Tokushukai Hospital, Tomisato-Sshi, Chiba-Ken, Japan