About: http://webisa.webdatacommons.org/450989249

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	Patients develop symptoms such as tremors or slurred speech only after about 80 per cent of these cells are lost, so they may have had the condition for some time before problems come to attention.
http://www.w3.org/ns/prov#wasQuotedFrom	pdf.org