1 Department of Anatomic Pathology, Hirosaki University Graduate School of Medicine, Japan.
2 Department of Clinical Research, Department of Diagnostic Pathology, National Hospital Organization Hakodate Hospital, Hakodate, Japan. Electronic address: kimura.noriko.sf@mail.hosp.go.jp.
3 Department of Respiratory Medicine, National Hospital Organization Hakodate Hospital, Hakodate, Hokkaido, Japan.
4 Department of Surgical Pathology, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan.