Detection Screening and Seasonality Evaluation of Hypoplastic Left Heart Syndrome in the Polish National Registry for Fetal Cardiac Anomalies from the years 2004 to 2016 Sokołowski Ł 1,2 , Fendler W 3,4 , Tobota Z 5 , Kordjalik P 2 , Krekora M 1 , Słodki M 2,6 Respondek-Liberska M 7 1. Department of Obstetrics & Gynaecology, Polish Mother’s Memorial Hospital, Lodz, Poland 2. Department of Prenatal Cardiology, Polish Mother’s Memorial Hospital, Lodz, Poland 3. Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA, USA 4. Department of Biostatistics and Translational Medicine, Medical University of Lodz, Lodz, Poland 5. Magnum Company, Warsaw, Poland 6. Faculty of Health Sciences, The State University of Applied Sciences in Plock, Poland 7. Department for Diagnoses and Prevention Fetal Malformations, Medical University of Lodz, Lodz, Poland Short running title (less than 70 characters) HLHS in Poland – prenatal detection improvement, no seasonality. This article is protected by copyright. All rights reserved. Accepted Article This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/pd.5677