Affiliations:
  1. Department of Perinatal Medical Center, School of Medicine, University of Occupational and Environmental health
  2. Department of Microbiology, Graduate school of medicine, University of Occupational and Environmental health
  3. Department of Obstetrics and Gynecology, School of Medicine, University of Occupational and Environmental health
  4. Department of Neurology, School of Medicine, University of Occupational and Environmental health