I did not read the article (yet), but please remember that it is possible to "prove" ANYTHING with the proper survey. We can't jump to conclusions based on any one article. (and I know how hard that is, especially when it is something we WANT to believe). I guess the reason I have NOT read this article is for the fear that I will start to believe it and some how it will change what I do, and what I do has worked for me through 20 years and just as many cats.