Fetal Echocardiographic Z-Score Pilot Project: Study Design and Impact of Gestational Age and Variable Type on Reproducibility of Measurements within and Across Investigators

¹University of California San Francisco, San Francisco, CA;²University of Utah, Salt Lake City, UT;³Stanford University, Stanford, CA;⁴Texas Children's Hospital, Houston, TX;⁵Hospital for Sick Children, Toronto, ON, Canada;⁶Children's National Medical Center, Washington, DC;⁷Fetal Heart Society, Laurel, MD.