1 Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan.
2 Department of Medicine and Clinical Science, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan. Electronic address: ohishk@yamaguchi-u.ac.jp.
3 Department of Dermatology, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan.
4 Department of Medicine and Clinical Science, Graduate School of Medicine, Yamaguchi University, Ube, Yamaguchi, Japan.