| Affiliation: | 1. University of California-Los Angeles (UCLA) School of Public Health, Epidemiology Department, Los Angeles, CA;2. Department of Hospital Epidemiology, Ronald Reagan UCLA Medical Center and David Geffen School of Medicine at UCLA, Los Angeles, CA;3. Department of Nursing, Ronald Reagan UCLA Medical Center and David Geffen School of Medicine at UCLA, Los Angeles, CA;4. Department of Obstetrics and Gynecology, Ronald Reagan UCLA Medical Center and David Geffen School of Medicine at UCLA, Los Angeles, CA;5. Department of Medicine, Ronald Reagan UCLA Medical Center and David Geffen School of Medicine at UCLA, Los Angeles, CA |
