1. Department of Pediatrics, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
2. Department of Infectious Disease, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
3. Department of Emergency Center, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
4. Division of Intensive Care, Department of Anesthesiology & Intensive Care Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
5. Department of Intensive Care, Yokosuka General Hospital Uwamachi, 2-36 Uwamachi, Yokosuka, Kanagawa, 238-8567, Japan