1. Department of Hematology and Medical Oncology, Japanese Red Cross Kumamoto Hospital, 2-1-1 Nagamine-minami, Higashi-Ku, Kumamoto 861-8520, Japan
2. Department of General Internal Medicine, Japanese Red Cross Kumamoto Hospital, 2-1-1 Nagamine-minami, Higashi-Ku, Kumamoto 861-8520, Japan