title: Serum activin A levels and tubal ectopic pregnancy.
authors.affiliation: Department of Obstetrics, Federal University of São Paulo (UNIFESP), São Paulo-SP, Brazil.
authors.forename: Julio
authors.initials: J
authors.lastname: Elito Júnior
authors.affiliation: Department of Obstetrics, Federal University of São Paulo (UNIFESP), São Paulo-SP, Brazil.
authors.forename: Leandro
authors.initials: L
authors.lastname: Gustavo Oliveira
authors.affiliation: Department of Obstetrics, Federal University of São Paulo (UNIFESP), São Paulo-SP, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Octávio Fernandes Silva
authors.affiliation: Department of Obstetrics, Federal University of São Paulo (UNIFESP), São Paulo-SP, Brazil.
authors.forename: Edward
authors.initials: E
authors.lastname: Araujo Júnior
authors.affiliation: Department of Obstetrics, Federal University of São Paulo (UNIFESP), São Paulo-SP, Brazil.
authors.forename: Luiz
authors.initials: L
authors.lastname: Camano