I think they all have some sort of damage, some more than others so I think it would be difficult to name them all.
Well this is just opinion but Dave Allen springs to my mind. I've been saying it for a few years, he sounds very different today than he did way back when he had his first interview with Kugan on IFL.
As an infant, I hear he knocked himself out with a soft nipple and the resulting damage never really did go away, despite the hyperbaric oxygen chamber therapy treatments he was said to have received twice a day for fourteen months.