Well, it's fairly common. What is even more common are CAT scans. CAT scans are X-rays. There are many X-rays in one exam. On average, depending on the instrument, one CAT scan will give you 15 millisieverts, which is considerable. It's external. It happens at once, but it's still radiation. That's 15 millisieverts and that's 15 times the radiation that a soldier at Doha may have had.
But it's not exactly the same, okay? It's external radiation. This is why I talked about angiography, because angiography is internal. It is something that is injected and it's inside the body.