Started with the same doctor who created NARAL
The Year after Roe Vs Wade, Dr. Nathanson, before he converted, as an atheist, on a level of science, wrote this paper. This was the beginning of his conversion. He would not film this for another 10 years:
He would not convert to Catholicism for 20 more years, though he did before his death. It would be two years before he wrote his book _Aborting America_ which was the end of his conversion to pro-life.
His work was utterly attacked of course, especially his ultrasound and eye scope films of abortions, both _The Silent Scream_ and _Eclipse of Reason_:
Dr. Nathanson's work has been censored often. Pro-choicers can't be bothered to look at it, calling it absolute emotional drivel.
Which is why, by the scientific method, it is all the more important to look at it from a scientific perspective.