Yes, you do! As I said, English is not one of my strong suits, I wish it was, but I'm glad it seems to be one of yours! However, as to the study, times change, advances are made and new things come along that can change peoples lives and today's children are the one's who are now benefiting from those advances. When one study comes out and says something works, other groups will conduct other studies, some might use the same number of subjects and others might double the number or really go crazy and use ten times the number of subjects to try and duplicate it. If these studies come to the same conclusions it is put into practice and becomes the de facto standard of treatment. You may not like it, but that's just the way it works.