can any one help me with following integral? I need closed-form
\begin{equation} \int_{-\infty}^{\infty} \frac{(\phi(x))^2}{\Phi(x)} \phi(ax+b) dx \end{equation}
where $\phi(x)= \frac{1}{\sqrt{(2 \pi)}} e^{-x^2/2}$ is the pdf of a standard normal distribution and $\Phi(x)= \int_{-\infty}^x \phi(t)dt$ is the CDF of a standard normal distribution.