1. Department of Internal Medicine, National Health Insurance Susami Hospital, Wakayama 649-2621, Japan
2. Department of Hematology, Kinan Hospital, Wakayama 641-8509, Japan
3. Department of Hematology/Oncology, Wakayama Medical University, Wakayama 641-8509, Japan
4. Department of Infection Control and Prevention, Wakayama Medical University, Wakayama 641-8509, Japan
5. Department of Emergency and Critical Care Medicine, Wakayama Medical University, Wakayama 641-8509, Japan
6. Department of Emergency and Intensive Care Medicine, Japanese Red Cross Wakayama Medical Center, Wakayama 640-8558, Japan
7. Department of Infectious Diseases, Japanese Red Cross Wakayama Medical Center, Wakayama 640-8558, Japan
8. Department of Internal Medicine, Kinan Hospital, Wakayama 646-8588, Japan