Hakimeh Sadeghian, MD, is Associate Professor of Cardiology and Echocardiography in the Department of Echocardiography, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. Dr. Sadeghian graduated from Tehran University of Medical Sciences in 1992 before specializing in cardiovascular medicine. She later studied in Paris, gaining diplomas in various specialties, including Congenital Heart Disease (Paris University V) and Echocardiography (Paris University XII). Dr. Sadeghian was responsible for founding the Echocardiography Department at Tehran Heart Center, where a range of procedures have been introduced, e.g., transesophageal echocardiography (including during surgery), dobutamine stress echocardiography, tissue Doppler echocardiography, 4D echocardiography, and fetal heart echocardiography. She is co-author (with Zahra Savand-Roomi) of the previous Springer book, Echocardiographic Atlas of Adult Congenital Heart Disease (2015). ; Zahra Savand-Roomi, MD, is a cardiologist in the Department of Echocardiography, Kowsar Hospital, Shiraz, Iran. She graduated from Yazd University of Medical Sciences, Iran, in 2000 before specializing in cardiovascular medicine at Shiraz University of Medical Sciences. Between 2010 and 2012 she studied in Tehran Heart Center, gaining fellowship in Echocardiography (Tehran University of Medical Sciences). Upon returning to Shiraz in 2012 she founded the Echocardiography Department in Kowsar Hospital, where a range of procedures are performed, e.g., transesophageal echocardiography (including during surgery), dobutamine stress echocardiography, tissue Doppler echocardiography and 4D echocardiography. She is co-author (with Hakimeh Sadeghian) of the previous Springer book, Echocardiographic Atlas of Adult Congenital Heart Disease (2015).