1. Department of Thoracic Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan
2. Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
3. Department of Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine, Sapporo, Japan
4. Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
5. Department of Molecular Medicine, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan