Even if the 2009 study is accurate and the findings conclusive, the increases risk would be from orgasm and ejaculation, not the masturbation. Genitals don't care what causes orgasm, even if the owner does.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'