1. Department of Respiratory Medicine, Juntendo University School of Medicine, Tokyo, Japan.
2. The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan.
3. The Division of Pathology, Japanese Red Cross Medical Center, Tokyo, Japan.
4. Pneumothorax Center, Nissan Tamagawa Hospital, Tokyo, Japan.
5. Department of Human Pathology, Juntendo University School of Medicine, Tokyo, Japan.