Psychological violence against pregnant women in a prenatal care cohort: rates and associated factors in São Luís, Brazil - Ribeiro, Marizélia Rodrigues Costa; Silva, Antônio Augusto Moura da; Alves, Maria Teresa Seabra de Brito e; Batista, Rosângela Fernandes Lucena; Rocha, Lourdes de Maria Leitão Nunes; Schraiber, Lilia Blima; Medeiros, Nilzângela Lima; Danielle Cristina Silva Costa,; Bettiol, Heloisa; Barbieri, Marco Antônio (BMC Pregnancy and Childbirth, 2014)