1. Department of Obstetrics and Gynecology; Division of Maternal-Fetal Medicine and Perinatal Research; The University of Texas Medical Branch at Galveston; Galveston TX USA
2. Department of Pathology; Botucatu Medical School; UNESP - Univ. Estadual Paulista; Botucatu Sao Paulo Brazil
3. Department of Microbiology and Immunology; The University of Texas Medical Branch at Galveston; Galveston TX USA