1. Pneumothorax Research Center, Nissan Tamagawa Hosipital, Tokyo, Japan
2. Department of Molecular Pharmacology, Graduate School of Medicine, Kitasato University, Sagamihara, Kanagawa, Japan
3. Department of Surgery, Jinken Clinic, Ebina, Kanagawa, Japan
4. Department of Respiratory Medicine, Graduate School of Medicine, Juntendo University, Tokyo, Japan