1 Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan; Allergy Center, Saitama Medical University, Saitama, Japan. Electronic address: tsoma@saitama-med.ac.jp.
2 Allergy Center, Saitama Medical University, Saitama, Japan.
3 Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan; Allergy Center, Saitama Medical University, Saitama, Japan.