1. Emergency and Critical Care Center; Kyushu University Hospital; Fukuoka Japan
2. Department of Pediatrics; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
3. Department of Emergency Medicine; Osaka Medical College; Osaka Japan
4. Department of Pediatrics; Osaka Medical College; Osaka Japan
5. Department of Emergency Medicine; School of Medicine; Yokohama City University; Yokohama Japan
6. Advanced Emergency and Critical Care Medical Center; Okayama University Hospital; Okayama Japan
7. Department of Pediatrics; Graduate School of Medicine; Dentistry and Pharmaceutical Sciences; Okayama University; Okayama Japan
8. Department of Emergency and Critical Care Medicine; University of Tsukuba Hospital; Tsukuba Japan