About: http://webisa.webdatacommons.org/212390041

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	Primary headache disorders, such as migraine, tension-type headache, cluster headache, and the so-called chronic daily headache syndrome, can cause substantial levels of disability.
http://www.w3.org/ns/prov#wasQuotedFrom	who.int