1. Department of Obstetrics and Gynecology , State University of Rio de Janeiro , Rio de Janeiro , Brazil
2. Cardoso Fontes Hospital, Gynecologic Section , Rio de Janeiro , Brazil
3. Perinatal Hospital , Rio de Janeiro , Brazil
4. Casa de Saúde São José , Rio de Janeiro , Brazil
5. Maternal and Child Department , Fluminense Federal University , Niteroi , Brazil
6. Department of Obstetrics and Gynecology , Beaujon Hospital-University of Paris , Clichy Cedex , France
7. Department of Obstetrics and Gynecology , The George Washington University Hospital , Washington , DC , USA
8. Department of Obstetrics and Gynecology , Main Line Health , Wynnewood , PA , USA