<http://schema.org/description>
"(HealthDay) -- People who've had a mild traumatic brain injury have more severe headaches and a greater number of headaches than those who've had moderate to severe brain injury, a new study finds."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2012-06-headaches-worse-mild-trauma-severe.html>