1. Department of Respiratory Medicine, Hakodate Goryoukaku Hospital , 38-3 Goryoukaku-cho, Hakodate-shi , Hokkaido 040-8611, , Sapporo, Japan
2. Japan and Department of Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine , 38-3 Goryoukaku-cho, Hakodate-shi , Hokkaido 040-8611, , Sapporo, Japan
3. Department of Respiratory Medicine, Hakodate Goryoukaku Hospital , 38-3 Goryoukaku-cho, Hakodate-shi , Hokkaido 040-8611, Japan
4. Department of Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine , Sapporo, Japan