<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/50/980x1470/548a6f9a6b895_-_rbk-vitamins-you-need-folic-acid-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1331/what-vitamins-supplements-should-i-take/>