id	domain	url
iberica-398	authors.nejm.org	http://authors.nejm.org/misc/articles.asp
iberica-398	www.nlm.nih.gov	http://www.nlm.nih.gov
iberica-398	authors.nejm.org	http://authors.nejm.org/misc/articles.asp
iberica-398	www.pbs.org	http://www.pbs.org/marktwain/learnmore/writings_jim.html
iberica-398	en.wikipedia.org	http://en.wikipedia.org/wiki/linebacker
iberica-398	www.nejm.org	www.nejm.org/cgi/reprint/354/2/e2.pdf