About: http://webisa.webdatacommons.org/209900281

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	Criteria were specified for study design, but other types of study designs were included on a case-by-case basis, which suggested a risk of selection bias.
http://www.w3.org/ns/prov#wasQuotedFrom	york.ac.uk