Affiliation: | (1) Department of Anesthesia, Hokkaido Children's Medical Center, 1-10-1, Zenibako, 047-02 Otaru, Hokkaido, Japan;(2) Department of Anesthesiology, Sapporo Medical University School of Medicine, South 1 West 16, Chuo-ku, 060 Sapporo, Hokkaido, Japan |