About: http://webisa.webdatacommons.org/356647667

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	Because the pain of a cluster headache comes on suddenly and may subside within a short time, over-the-counter pain relievers such as aspirin or ibuprofen are not usually effective.
http://www.w3.org/ns/prov#wasQuotedFrom	salemnews.net