Finally, someone put this to rest with a concise study. Yes it is possible. In many cases it was the only known risk factor. The fact that VA lists it as a risk in the Risk Factors Questionnaire is a dead giveaway. Regardless, VA has been known to say it isn’t or that the risk is so statistically insignificant as to be unmeasurable. This study revokes the myth. As Murphy has been quick to point out over the years, if it can’t happen—it will.