1 Department of Thoracic Surgery, Shin-Kokura Hospital, Federation of National Public Service, Personnel Mutual Aid Associations, Kitakyushu, Japan. Electronic address: ryoichi@med.uoeh-u.ac.jp.
2 Department of Thoracic Surgery, Shin-Kokura Hospital, Federation of National Public Service, Personnel Mutual Aid Associations, Kitakyushu, Japan.
3 Department of Anesthesiology, Shin-Kokura Hospital, Federation of National Public Service, Personnel Mutual Aid Associations, Kitakyushu, Japan.