<http://schema.org/description>
"A Norwegian survey carried out between 1974 and 2003 showed that there was a graded independent increase in the risk of AF with increasing levels of physical activity in a population-based study among men with ostensibly no other heart disease. In women the data were inconclusive."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2011-08-leisure-time-physical-atrial-fibrillation-men.html>