It's really quite simple. As I mentioned earlier, we have backup supply agreements in place with our suppliers. Those backup agreements have pricing defined. So it's already pre-defined, well in advance, what we would pay for those isotopes and that is part of our normal business evaluation.
The critical point here is we have an obligation to the health care system. So we went out to those other suppliers and we asked them to send us more product in accordance with the agreements that we have in place.