1. Virus Research Center, Clinical Research DivisionSendai Medical Center, 2‐8‐8 MiyaginoMiyagino‐kuSendai 983‐8520Japan
2. Department of Medical Microbiology, Mycology and ImmunologyTohoku University Graduate School of Medicine2‐1 Seiryo‐machi, Aoba‐kuSendai 980‐8575Japan
3. Department of Dermatology, Faculty of MedicineYamagata University2‐2‐2 Iida‐nishiYamagata 990‐9985Japan