 individuals who have had specific surgeries in an area. And when we do these scans, we go in blind. So we have no idea and we don't want to know what their complaints are. So we'll do the scan and whatever the results are, they're that. And a lot of times we'll find unusual areas and we say, hmm, that's strange. We don't typically get a positive reading in that area. And they'll say, well, we've had a surgery.