1 Division of Anesthesia and Pain Medicine, Fukushima Medical University Hospital, 1 Hikarigaoka, Fukushima City, Fukushima, 960-1295, Japan. [email protected].
2 Division of Anesthesia and Pain Medicine, Fukushima Medical University Hospital, 1 Hikarigaoka, Fukushima City, Fukushima, 960-1295, Japan.