American Cancer Society | http://www.cancer.org/ |
John Hopkins University | http://articles.baltimoresun.com/2012-10-30/sports/bal-20121030_1_john-cena-breast-wwe-universe |
The Sun | http://www.thesun.co.uk/sol/homepage/news/4680686/cancer-research-uk-dryathlon-alcohol-snub.html#ixzz2E9FbahqF |