1. Project Research Center for Nosocomial Infectious Diseases, Hiroshima University, Hiroshima, Japan
2. Division of Infectious Diseases Laboratory, Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima, Japan
3. Division of Laboratory Medicine, Hiroshima University Hospital, Hiroshima, Japan
4. Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan
5. Hiroshima and Department of Gastroenterological and Transplant Surgery, Hiroshima University, Hiroshima, Japan