COVID-19(20) Pregnancy(11) SARS-CoV-2(9) pregnancy.(7) Anxiety(3) coronavirus(3) COVID-19 pandemic(2) fetus(2) COVID(2) systematic screening.(2) stress.(2) pandemic(2) obstetrics(2) antenatal care(2) ultrasound.(2) Admission(1) Prematurity(1) SARS(1) Postpartum(1) Meta-analysis(1) Coronavirus 2019(1) frame-shifting(1) Transmission(1) Severe acute respiratory syndrome coronavirus 2.(1) Obstetric(1) baseline(1) nuchal translucency(1) Prognosis.(1) quantitative reverse transcription polymerase chain reaction(1) perinatal outcomes(1)