1 Department of Anesthesiology and Critical Care, Jichi Medical University Saitama Medical Center, Saitama, Japan. Electronic address: ken.f.0406@gmail.com.
2 Department of Anesthesiology and Critical Care, Jichi Medical University Saitama Medical Center, Saitama, Japan; Department of Anesthesia, Saiseikai Utsunomiya Hospital, Tochigi, Japan.
3 Department of Anesthesiology and Critical Care, Jichi Medical University Saitama Medical Center, Saitama, Japan.