A personal note:
I am a very busy community hospital general radiologist and have now spent way too much time and effort trying to fill a gap left by those in academic circles. What I have written is on best-efforts basis. I would like to hear from those with reasoned criticisms or with new ideas or information. A put-down is not a rebuttal. I certainly cannot match the publication and organizational credentials of those who take an “establishment” view. At the risk of being tacky, however, I obtained an undergraduate science degree at 18 and scored in the 99.9th percentile of part 3 of the US National Boards (1971), and so do not feel totally intellectually overwhelmed by them.