1. Department of Respiratory Medicine, Japanese Red Cross Society, Omori Red Cross Hospital, Japan
2. Department of Gastroenterology, Japanese Red Cross Society, Omori Red Cross Hospital, Japan
3. Department of Surgery, Japanese Red Cross Society, Omori Red Cross Hospital, Japan
4. Department of Pathology, Japanese Red Cross Society, Omori Red Cross Hospital, Japan
5. Department of Pathology, Toho University School of Medicine, Japan