1. Department of Obstetrics and Gynecology, School of Medicine, Universidade Estadual de Campinas (Unicamp), São Paulo, Brazil
2. Department of Obstetrics and Gynecology, The Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
3. Department of Periodontics, São Leopoldo Mandic Dental Research Institute, Campinas, Brazil
4. Department of Gynecology and Obstetrics, Hospital das Clinicas and University of São Paulo Medical School, São Paulo, Brazil
5. Department of Microbiology, The Fluminense Federal University, Rio de Janeiro, Brazil