In the first study, published yesterday in JAMA, researchers from the Vaccine Safety Datalink (VSD) surveillance network used diagnostic and procedure codes and electronic health records to identify and assign gestational ages of miscarriages and ongoing pregnancies from Dec 15, 2020, to Jun 28, 2021.
The VSD is a collaboration between the Centers for Disease Control and Prevention (CDC) and nine health systems that represents about 3% of the US population.
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