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     The significant appearance of sinus bradycardia in the age group 60-70 could be caused by multiple factors. 
     In this case the physiological age could play a huge factor. The sinus node continuously generates electrical impulses, thus setting the normal rhythm and rate in a healthy heart. With increasing age, the sinus node becomes less responsive which leads to a slower heart rate of 60 bpm or less.
     Another reason could be increased medication, which is more likely to be the case when older. A sinus bradycardia could appear as a side effect of that medication.
-    (source: https://doi.org/10.1253/jcj.57.760, last visit: 10.06.2024)
-    (source: https://doi.org/10.7861%2Fclinmed.2022-0431, last visit: 10.06.2024)
+    <br>(source: https://doi.org/10.1253/jcj.57.760, last visit: 10.06.2024)
+    <br>(source: https://doi.org/10.7861%2Fclinmed.2022-0431, last visit: 10.06.2024)
 
     But what could be the reason for the more frequent appearance of the sinus bradycardia in the age group 60-70 than in other older age groups?