Funding:
This study was supported by grants from Instituto de Salud Carlos III
208 (ISCIII) COV20/00188 and iMaterna Foundation (Fundación para la
Investigación y el Desarrollo de la Medicina Materno-Fetal y Neonatal,
Registry No: 2148). Perkin Elmer provided the reagents for laboratory
testing and Synlab Diagnósticos Globales provided the instruments and
human resources to perform the analyses of the samples. The funders had
no role in study conception and execution, data collection, analyses of
the results, nor in the writing of the manuscript or decision to submit
for publication.