About: http://webisa.webdatacommons.org/397396080

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	There is no reliable standard against which to assess the accuracy with which subjective symptoms such as pain are reported, but the questions about pain and disability had again been used successfully in earlier studies.
http://www.w3.org/ns/prov#wasQuotedFrom	pubmedcentralcanada.ca