Address correspondence to Toshiaki Fujisawa, Chief of the Working Group on Guidelines Development for Intravenous Sedation in Dentistry, the Japanese Dental Society of Anesthesiology, Department of Dental Anesthesiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, North-13, West-7, kita-ku, Sapporo 060-8586 Japan; fujitosi@den.hokudai.ac.jp.