About: http://webisa.webdatacommons.org/334665720

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	Many theories exist as to the cause, including mineral deficiencies and poor circulation, but none has been totally proved.
http://www.w3.org/ns/prov#wasQuotedFrom	bbc.co.uk