1. Barsoom MJ, Deborah M. Is an isolated fetal cardiac echogenic focus an indication for fetal echocardiography? J Ultrasound Med. 2001;20:1043–6.
2. Chu CL, Gui YH, Ren YY, et al. The impacts of maternal gestational diabetes mellitus (GDM) on fetal hearts. Biomed Environ Sci. 2012;25(1):15–22.
3. Slodki M, Szymkiewicz-Dangel J, Tobota Z, et al. The polish national registry for fetal cardiac pathology: organization, diagnoses, management, educational aspects and telemedicine endeavors. Prenat Diagn. 2012;32:1–5.
4. Hamar BD, Dziura J, Friedman A, et al. Trends in Fetal Echocardiography and Implications for Clinical Practice 1985 to 2003. J Ultrasound Med. 1985;2006(25):197–202.
5. Castro-Coelho F, Freitas T, Silva M, et al. Referral indications for fetal echocardiography in the Madeira islands. 13th World Congress in Fetal Medicine, Hospital Dr. Nélio Mendonça, Funchal, Portugal.