[1
]
Department of Thoracic Surgery, Hitachi General Hospital, Hitachi, Ibaraki, 317-0077,
Japan. ichimura@md.tsukuba.ac.jp.
[2
]
Department of Thoracic Surgery, University of Tsukuba, Tsukuba, Ibaraki, 305-8575,
Japan. ichimura@md.tsukuba.ac.jp.
[3
]
Department of Thoracic Surgery, Faculty of Medicine, Hitachi Medical Education and
Research Center, University of Tsukuba, 2-1-1 Jyounan, Hitachi, Ibaraki, 317-0077,
Japan. ichimura@md.tsukuba.ac.jp.
[4
]
Department of Thoracic Surgery, Hitachi General Hospital, Hitachi, Ibaraki, 317-0077,
Japan.
[5
]
Department of Biostatistics, Faculty of Medicine, University of Tsukuba, Tsukuba,
Ibaraki, 305-8575, Japan.
[6
]
Department of Thoracic Surgery, University of Tsukuba, Tsukuba, Ibaraki, 305-8575,
Japan.