1. Division of Thoracic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo 650‑0017, Japan
2. Division of Thoracic Surgery, Hyogo Cancer Center, Akashi, Hyogo 673‑8558, Japan
3. Department of Diagnostic Pathology, Kobe University Graduate School of Medicine, Kobe, Hyogo 650‑0017, Japan