About: http://webisa.webdatacommons.org/3520842

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	A secondary headache is a headache that is present because of another condition such as a sinus headache from sinusitis.
http://www.w3.org/ns/prov#wasQuotedFrom	migraine.com