COVID-19(16) SARS-CoV-2(9) Pregnancy(9) Patient(9) COVID-19 infection(7) pregnant women(7) offered(6) hospital(6) multicenter(6) French(6) Neonatal(5) virus(5) patients(5) management(5) prospective observational study(4) ELISA(4) information(4) Factor(4) diagnosed(4) Inclusion(4) were assessed(4) Infection(4) Positive test(4) prevalence of COVID-19(4) SARS-CoV-2 IgG antibody(4) SARS-CoV-2 IgG(4) Sample size(4) Level(4) antibody(4) outcome(4)