The obstetric history evaluation, vaginal infections and cervical length as risk factors for preterm birth - Cavalli, Ricardo de Carvalho; Camayo, Francisco Javier Alvarez; Barbieri, Marco Antonio; Bettiol, Heloisa; Quintana, Silvana Maria; Cardoso, V. C. (World Congress on Controversies in Obstetrics, Gynecology and Infertility (COGI), 2015)