Maternal COVID-19 Serological Changes—Comparison between Seroconversion Rate in First and Third Trimesters of Pregnancy and Subsequent Obstetric Complications: A Cohort Study by Maria N. Rayo, Adriana Aquise, Irene Fernandez-Buhigas, Lorena Gonzalez-Gea, Coral Garcia-Gonzalez, Mirian Sanchez-Tudela, Miguel Rodriguez-Fernandez, Diego Tuñon-Le Poultel, Belen Santacruz, Maria M. Gil

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