1. Maternal and Child Department, Faculty of Medicine, Federal University of Pelotas, Pelatos, Brazil
2. Division of Infectious Diseases, Department of Medicine, Johns Hopkins University, Baltimore, MD, USA
3. Department of Gynecology and Obstetrics, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
4. Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA