 Yeah, there may be a number of reasons why that is. Part of it may be the hospitals and the availability of beds. Some of these cases will come in severe and the emergency departments are actually monitoring them and managing them and they're able to discharge them at the end of the time period. And I think we see that to some extent at the University of Virginia, too, where they come in severe, but given enough time, appropriate management, they recover. And it partially depends on the elimination half-life of the substance they were exposed to.