1. Department of MicrobiologyFukushima Medical University School of MedicineFukushima Japan
2. Division of MicrobiologyTohoku Medical and Pharmaceutical University School of Medicine Miyagi Japan
3. Laboratory of Microbiology and ImmunologyGifu Pharmaceutical UniversityGifu Japan
4. Department of Perinatal Medicine and Maternal CareNational Center for Child Health and DevelopmentTokyo Japan
5. Shirota Obstetrical and Gynecological Hospital Kanagawa Japan
6. Ujiie Memorial Clinic for ChildrenHokkaido Japan