1. Department of Respiratory Medicine, Chutoen Medical Center, Kakegawa, Shizuoka, Japan
2. Department of Respiratory Medicine, Nagoya University Hospital, Nagoya, Aichi, Japan
3. Department of Pathology, Hamamatsu University Hospiital, Hamamatsu, Shizuoka, Japan
4. Department of Pathology, Hamamatsu University Hospital, Hamamatsu, Shizuoka, Japan