1 Department of Allergy and Respiratory Medicine, The Fraternity Memorial Hospital, Tokyo, Japan.
2 Department of Allergy and Respiratory Medicine, The Fraternity Memorial Hospital, Tokyo, Japan; Department of Laboratory Medicine, Dokkyo Medical University, Koshigaya Hospital, Koshigaya City, Saitama, Japan.
3 Department of Allergy and Respiratory Medicine, The Fraternity Memorial Hospital, Tokyo, Japan. Electronic address: ym_to@yahoo.co.jp.