About: http://webisa.webdatacommons.org/157807480

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	at case-control studies on helmets have not adequately controlled for all potential confounders, especially unmeasured factors such as differential risk taking behaviour in cases and controls.
http://www.w3.org/ns/prov#wasQuotedFrom	planetizen.com