Mental health and physical inactivity during pregnancy: a cross-sectional study nested in the BRISA cohort study - Takahasi, Eliana Harumi Morioka; Alves, Maria Teresa Seabra Soares de Britto e; Alves, Gilberto Sousa; Silva, Antonio Augusto Moura da; Batista, Rosângela Fernandes Lucena; Simões, Vanda Maria Ferreira; Del Ben, Cristina Marta; Barbieri, Marco Antonio (Cadernos de Saúde Pública, 2013)