About: http://webisa.webdatacommons.org/54065722

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	One reference is a letter to the editor; one reference is in press; and one reference is a roundtable discussion and monograph through a restricted educational grant by DePuy Spine.
http://www.w3.org/ns/prov#wasQuotedFrom	cms.gov