<http://webisa.webdatacommons.org/prov/456959866>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/49186195> .
<http://webisa.webdatacommons.org/49186195>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<questia.com> .
<http://webisa.webdatacommons.org/49186195>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/49186195>	<http://www.w3.org/ns/prov#value>	"Aside from classical migraine, there are many other types of migraine and in most the headache is not heralded by an aura." .