1. The First Department of Internal Medicine, Shinshu University School of Medicine, Japan
2. Department of Respiratory Medicine, Okaya City Hospital, Japan
3. Department of Respiratory Medicine, Suwa Redcross Hospital, Japan
4. Comprehensive Cancer Center, Division of Clinical Oncology, Shinshu University School of Medicine, Shinshu University Hospital, Japan
5. Department of Respiratory Medicine, Shinshu Ueda Medical Center, Japan
6. Department of Respiratory Medicine, Nagano Municipal Hospital, Japan
7. Department of Otorhinolaryngology, Shinshu University School of Medicine, Japan