Affiliation: | a Division of Thoracic Surgery, Tochigi Cancer Center, Utsunomiya, Japan b Division of Pathology, Tochigi Cancer Center, Utsunomiya, Japan c Division of Epidemiology, Tochigi Cancer Center, Utsunomiya, Japan d Division of Thoracic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan e Pediatrics Unit, Oomuta National Hospital, National Hospital Organization, Oomuta, Japan. |