Statistically some women have breast cancer between forty and fifty. Statistically some of those women will have aggressive cancers that, if not found very early, will kill them, but which if found very early might not kill them. No one with any sense at all doubts that some women will die if the norm shifts from testing after forty to testing after age fifty. The question is rather, are those extra deaths justified by the reduction in costs, false positives, and unnecessary surgeries caused by the extra ten years of testing? Because it's not just about money, there will always be mistakes in any testing program, and some few of those mistakes will be repeated resulting in the pain and risks of unnecessary surgery. The opinion of the panel is yes, although more women will die from the delayed testing program, the numbers will be small in comparison to the benefits. The opinion of the American Cancer Society is no, the reductions in costs, false positives, and unnecessary surgeries are not worth the lives of those additional women. You should not need links to figure this out. For specific doctors, try any associated with the American Cancer Society for a start.