: clinicaltrials_resource:00003aa5b9e3db40e06a7d66e7826d47http://bio2rdf.org/ Create a prefix for http://bio2rdf.org/ Hit Enter to save Double click to create a prefix | : clinicaltrials_vocabulary:measurehttp://bio2rdf.org/ Create a prefix for http://bio2rdf.org/ Hit Enter to save Double click to create a prefix | 7-day point prevalence smoking abstinence verified by saliva cotinine taken |