1. Hakodate Goryoukaku Hospital , 38-3 Goryoukaku-cho, Hakodate-shi, Hokkaido 040-8611, Japan
2. Department of Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine , Sapporo, Japan
3. Department of Surgical Pathology, 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 , South 1, West 17, Chuo-ku, Sapporo, 060-8556, Japan
5. Department of Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine , South 1, West 17, Chuo-ku, Sapporo, 060-8556, Japan . email: tsh715@gmail.com