1. Departments of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan
2. Obsterics and Gynecology, Sapporo Medical University School of Medicine, Sapporo, Japan
3. Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine, Sapporo, Japan
4. Surgical Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan