RT Journal Article SR Electronic T1 Transthoracic colour-encoded M-mode echocardiography demonstrating neonatal atrial flutter JF Archives of Disease in Childhood - Fetal and Neonatal Edition JO Arch Dis Child Fetal Neonatal Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 222 OP 222 DO 10.1136/archdischild-2020-319072 VO 106 IS 2 A1 Karen Donceras Nadua A1 Ming Xu A1 Jonathan Tze Liang Choo YR 2021 UL http://fn.bmj.com/content/106/2/222.abstract AB