Medical research, no writing involved.

I need all the peer-reviewed studies on pes planus aka flat feet and what it does to the rest of the human body in a negative term. Such as how flat feet affect the ankles, knees, hips, back. As well as how the ankles affects the knees, hips and back. How the knees affect the hip, and how the back is affected by the hips. Research only. No pediatric studies and note orthosis studies. Just flat feet and the long-term effects on the rest of the body. I found five or six but it's not enough. Hopefully you have better resources, such as medical libraries and such to find more. Remember they have to be studies by qualified organization or qualified individuals.