About: http://webisa.webdatacommons.org/18927877

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	Age is a risk factor for ovarian cancer, and could therefore introduce bias caused by age or menopausal differences between the cases and controls.
http://www.w3.org/ns/prov#wasQuotedFrom	plos.org