Maternal-Fetal Medicine Units Network

Baylor College of Medicine

Brown University

Case Western

Columbia University

Duke University

Magee Womens

Northwestern

Ohio State University

UAB- Birmingham

University of California San Francisco

UNC Chapel Hill

University of Pennsylvania

UT Houston

University of Utah

The George Washington University Biostatistics Center

Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)