Does anyone know of any studies that address adoption and ptsd? And specifically how adoption can or does affect the adoptee?

I know there are many people out there that think of the process (especially the scenario where an infertile coUple tries endlessly to have the own bio children to no avail and then to adopt as a plan b) as a win/win to both parties but that doesn't make sense to me. As a human being knowing your bio parents didn't want you and the adoptive parents see you as a consolation prize. It certainly does not feel like a winning combo.
Especially when like in many cases the adoptive parents suddenly and miraculously get pregnant thus deeming their bio kid a "miracle”.

Just wondering. Thanks!