1. Department of Internal Medicine, International University of Health and Welfare (IUHW) Shioya Hospital, Yaita, Japan
2. Respiratory Diseases Center, IUHW Mita Hospital, Tokyo, Japan
3. Department of Pulmonary Medicine, School of Medicine, IUHW, Narita, Japan
4. Department of Pharmacology, School of Pharmacy, IUHW, Otawara, Japan
5. Department of Internal Medicine, National Hospital Organization Murayama Medical Center, Musashimurayama, Japan
6. Department of Respiratory Medicine, School of Medicine, Keio University, Tokyo, Japan