It was also linked to medical conditions like heart disease, liver disease and cancer.

VOA: special.2009.09.08

Diseases like cirrhosis of the liver,cancer, heart and blood system diseases are the others.

VOA: special.2011.02.16

I looked and I said,hey, that's skateboarding on snow. That's perfect for me." And he's still at it 27 years later in a career that has included not only injuries like a broken collar bone, broken ankles and torn knee ligaments, but also a liver transplant.

VOA: standard.2010.02.26