RT Journal Article SR Electronic T1 Left Axis Deviation in Asymptomatic Children JF AAP Grand Rounds JO AAP Grand Rounds FD American Academy of Pediatrics SP 66 OP 66 DO 10.1542/gr.39-6-66 VO 39 IS 6 YR 2018 UL http://aapgrandrounds.aappublications.org/content/39/6/66.abstract AB