1 Department of Respiratory Medicine and Allergy Center, Saitama Medical University, Saitama, Japan; Department of General Internal Medicine, Saitama Medical University, Saitama, Japan.
2 Department of Respiratory Medicine and Allergy Center, Saitama Medical University, Saitama, Japan. Electronic address: nakagomek-tky@umin.ac.jp.
3 Department of Respiratory Medicine and Allergy Center, Saitama Medical University, Saitama, Japan.
4 Department of General Internal Medicine, Saitama Medical University, Saitama, Japan.