Those decisions are never easy. Often, actually, when drugs for rare disorders come on the market, because of the small numbers of people, we really don't have enough information about those products to make good decisions. That's why we need ongoing studies once those drugs are on the market.
As Dr. MacKenzie, I think, was pointing out, if those drugs, based on the ongoing studies, prove not to be beneficial either to people as a whole or to individuals, we need to be prepared to stop paying for those. Obviously, if they're beneficial, then we should continue to pay for them.