<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef.bbci.co.uk/news/560/media/images/65631000/jpg/_65631099_c0135780-gardasil_human_papillomavirus_vaccination-spl.jpg>
<http://www.bbc.co.uk/news/health-21282382>