1 Department of Anesthesiology, Tokyo Dental College Ichikawa General Hospital, 5-11-13, Sugano Ichikawa, Chiba, 272-8513, Japan.
2 Department of Anesthesiology, Tokyo Dental College Ichikawa General Hospital, 5-11-13, Sugano Ichikawa, Chiba, 272-8513, Japan. hshiroyukiseki@gmail.com.