1. Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School, Osaka, Japan
2. Yakult Central Institute for Microbiological Research, Tokyo, Japan
3. Department of Biomedical Statistics, Osaka University Graduate School of Medicine, Osaka, Japan
4. Department of Emergency and Critical Care, Osaka General Medical Center, Osaka, Japan
5. Department of Emergency and Critical Care Medicine, Kansai Medical University, Hirakata-City, Osaka, Japan