Do you know, there were times I would get so annoyed at the Watchtower's refusal to NAME quotes and references. Why would they not want us to look up anything?? It was so blatantly obvious that they would do all our thinking and research for us, and spoon feed it to us (at the proper time!) As a good little sheep, I tried to stay meek and humble and accept the direction and spiritual feeding program from "Jehovah's Organization" (ugh!) and so I (usually) accepted that we should trust our food implicitly... without question... (more ugh!)
Anyway, it will be interesting to see if those "studies" to which the WT is referring shows up or if they are merely going by their *own* "research" -- bias, experiences and anecdotes.