1. Department of Anesthesiology, Tokushima University, Tokushima JAPAN
2. Department of Anesthesiology and Critical Care, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima JAPAN
3. Department of Anesthesiology, Osaka Dental University, Osaka JAPAN
4. Department of Orthopedics, Institute of Biomedical Sciences, University of Tokushima Graduate School, Tokushima, JAPAN