1) Division of Thoracic and Breast Surgery, Department of Surgery, Faculty of Medicine, University of Miyazaki Hospital, Miyazaki, Japan
2) Department of Medical Safety Management, University of Kyushu, Fukuoka, Japan
3) Department of Medical Safety Management, Tokyo Medical and Dental University Medical Hospital, Tokyo, Japan
4) Department of Clinical Quality Management, Osaka University Hospital, Suita, Japan

Takanori Ayabe¹⁾, Shin Ushiro²⁾, Atsushi Kudo³⁾, Nukumi Kitamura⁴⁾, Takuro Saito⁴⁾, Kyota Nakamura⁴⁾, Kazue Nakajima⁴⁾