1. Fuji Research Laboratories; Kyowa Medex Co., Ltd.; Shizuoka; Japan
2. Tokyo Research Park; Kyowa Hakko Kirin Co., Ltd.; Tokyo; Japan
3. Department of Research and Development; Kyowa Medex Co., Ltd.; Tokyo; Japan
4. Department of Infection Biology; Faculty of Medicine; University of Tsukuba; Tsukuba; Japan
5. Department of Pediatrics; Faculty of Medicine; University of Toyama; Toyama; Japan