Atterhög , J.-H., Ekelund , L.-G., Ericsson , G., & Ahlborg , B. (1980). Significance of Primary T Wave Aberrations in the Electrocardiogram of Asymptomatic Young Men: Part I. Electrocardiographic data. Upsala Journal of Medical Sciences, 85(2), 125-142. https://doi.org/10.3109/03009738009179180