One in nine U.S. children currently has a diagnosis of attention deficit/hyperactivity disorder. And, according to a new study, some of those could be misdiagnosed.

This new research confirms what many psychologists have seen in their own practices: that a child with an ADHD diagnosis is most likely to have also experienced prolonged stress or trauma in early life, whether it's poverty, divorce, violence or family substance abuse.

Dr. Caelan Kuban, director of The National Institute for Trauma and Loss in Children, is one of those practitioners who has witnessed this type of misdiagnosis. She joins Take Two to talk about whether children who have experienced trauma are being misdiagnosed with ADHD.