id	domain	url
gra-849	www.who.int	http://www.who.int/mediacentre/factsheets/fs297/en/cancer
gra-849	dx.doi.org	http://dx.doi.org/10.7314
gra-849	www.ncbi.nlm.nih.gov	http://www.ncbi.nlm.nih.gov
gra-849	www.ncbi.nlm.nih.gov	http://www.ncbi.nlm.nih.gov/pubmed/21479349