About: http://webisa.webdatacommons.org/147591304

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	The various surgical access devices can further include a wound protector, cannula, ring retractor, or other member for forming a pathway through tissue (hereinafter generally referred to as a retractor).
http://www.w3.org/ns/prov#wasQuotedFrom	google.com