The adoption of concealment strategies is certainly an issue. It becomes very much a case of whack-a-mole.
Various lists, as you described, do exist in the United States. We have consolidated those lists here within the A&M system and we have used that as a tool and an integral part of our due diligence process. Certainly, I think that those kinds of lists, while they potentially can lead to concealment, are also very valuable to guiding researchers to proper relationships.