Your [3] reference is not the original study. Some of the original studies were late 80's, early 90's and were discussed in the media even on the nightly news.

Your [3] reference is not the original study. Some of the original studies were late 80's, early 90's and were discussed in the media even on the nightly news. They were printed in magazines that people at the time subscribed to. The discussion about the issue died down and was later resurrected by those who published that article. The original time period when this was in the news would be 1995-1998 since I know where I worked at the time. I don't know why it did not stick in the public's consciousness back in the 90's. I do know that it faded from the news stream over time only to be resurrected years later when the issues that were highlighted had affected a much larger number of people.