1) Training Center of nurse designated procedures of Fukushima Medical University, Fukushima, Japan
2) Department of Hepato-Biliary-Pancreatic and Transplant Surgery, Fukushima Medical University, Fukushima, Japan
3) Department of Coloproctology, Aizu Medical Center, Fukushima Medical University, Aizuwakamatsu, Japan
4) Department of Chest Surgery, Fukushima Medical University, Fukushima, Japan

Akira Kenjo¹⁾²⁾, Shigeru Marubashi¹⁾²⁾, Syungo Endo¹⁾³⁾, Hiroyuki Suzuki⁴⁾