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Corresponding Author
Department of Pulmonary Medicine, Hakodate Goryoukaku Hospital, Hakodate, Japan
Department of Respiratory Medicine and Allergology, Sapporo Medical University School of Medicine, Sapporo, Japan
Correspondence
Toshiyuki Sumi, Department of Pulmonary Medicine, Hakodate Goryoukaku Hospital, 38-3 Goryoukaku-Cho, Hakodate-shi, Hokkaido 040-8611, Japan.
Email: tsh715@gmail.com
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