| Affiliation: | 1. Department of Pediatrics, Division of Pediatric Infectious Diseases, Los Angeles Biomedical Research Institute at Harbor-UCLA and David Geffen School of Medicine at UCLA, Torrance, CA;2. Department of Obstetrics and Gynecology, Cedars Sinai Medical Center and David Geffen School of Medicine, University of California, Los Angeles, CA;3. Department of Perinatal Medicine, Providence Little Company of Mary Hospital, Torrance, CA;4. Immunization Services Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA |
