The more recent articles I came across in this search call that into question. I refer you to this study, in Archives of Internal Medicine, and the ACOG committee statement here , and the National Cancer Institute statement. There are similar statements from Cancer.org, etc. I thought I had read something more recent that did affirm the link, but I can't find anything like that now. Given that, I must regard it as unproven and questionable.
Did you see wagglebee’s links in comment 62?
Are you aware that feminism/the abortion industry are extremely influential?