About: http://webisa.webdatacommons.org/375493357

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	They measured direct costs, which included expenditures for surgical and nonsurgical end-stage knee OA treatment, as well as indirect costs, including lost wages, lower earnings and disability payments, according to the abstract.
http://www.w3.org/ns/prov#wasQuotedFrom	policymed.com