About: http://webisa.webdatacommons.org/33085029

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	Participants were asked about vitamin use to ensure that folic acid and other B vitamins were not taken during the intervention period.
http://www.w3.org/ns/prov#wasQuotedFrom	nih.gov