RT Journal Article SR Electronic T1 Diagnostic Accuracy of a Smartphone-Operated Single-Lead ECG for Detection of Rhythm and Conduction Abnormalities in Primary Care JF The Annals of Family Medicine JO Ann Fam Med FD American Academy of Family Physicians SP iii OP iii DO 10.1370/afm.2458 VO 17 IS 5 A1 Divya Manda A1 Michael E Johansen YR 2019 UL http://www.annfammed.org/content/17/5/iii.abstract AB