National survey regarding obstetricians¿ perspective of obstetric emergencies in Brazil Vitória Espindola Leite Borges; Francisco Barbosa Jr; Fábio Fernandes Neves; Maria Rita de Souza Mesquita; Elaine Christine Dantas Moisés;

Risk factors for oxygen requirement in hospitalized pregnant and postpartum women with COVID-19 Fernanda Spadotto Baptista; Cristiane Freitas Paganoti; Ursula Trovato Gomez; Stela Verzinhasse Peres; Luiz Marcelo Malbouisson; Maria de Lourdes Brizot; Rossana Pulcineli Vieira Francisco;