nancy thaler and joseph shapiro, thank you for being here. joseph shapiro, i'll start with you.know there has been a lot of focus on sexual assault in the last few months, sexual harassment after the harvey weinstein revelations, but you were working on this way before that. what true your attention? >> i've written about disabilities issues for a long time now. people with intellectual disabilities have been telling me about this for years and talking about how the past sexual violence in their lives and how it gets in the way of living their lives now, of having the relationships they want. they told me about this, it's important to them and i thought it was time to write about it. >> woodruff: before we hear about more about what joe uncovered, why is this particular group of people so vulnerable to this? >> i think there are a lot of factors that lead to their vulnerability and i think it begins early in life. as children, they are touched by doctors and therapists and their privacy is invaded in a way that's greater than it is for typical children and, so, they begin life n