About: http://webisa.webdatacommons.org/19719945

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	Now a days, we would like to control for all the different types of exposure to germs that doctors may have, and we will get better estimates after controls, but it is not necessary to have a valid, unbiased experiment.
http://www.w3.org/ns/prov#wasQuotedFrom	econtalk.org