About: http://webisa.webdatacommons.org/323580279

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Migraines are called primary headaches because the pain isn???t caused by another disorder or disease such as a brain tumor or head injury.
http://www.w3.org/ns/prov#wasQuotedFrom	migraine.com