Kesek M., Rönn F., Tollefsen T., Höglund N., Näslund U., and Jensen S. M. “Symptomatic Improvement After Catheter Ablation of Supraventricular Tachycardia Measured by the Arrhythmia-Specific Questionnaire U22”. Upsala Journal of Medical Sciences, vol. 116, no. 1, Nov. 2010, pp. 52–59, doi:10.3109/03009734.2010.517875.