1. Department of Respiratory Medicine, Saiseikai Kumamoto Hospital, Kumamoto 861-4193, Japan
2. Department of Respiratory Medicine, Nara Medical University, Nara 634-8522, Japan
3. Department of Pulmonology, Yokohama City University Hospital, Yokohama 236-0004, Japan
4. Department of Respiratory Medicine, Yokohama Minami Kyousai Hospital, Yokohama 236-0037, Japan
5. Chemotherapy Center, Yokohama City University Hospital, Yokohama 236-0004, Japan