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Dr. Helen Blair Simpson is a psychiatry professor and O.C.D. researcher at Columbia University.

Dr. Uma Reddy, who led NY-CHAMP’s work, said that the interventions carried out by her team probably saved taxpayers money.

Editor's Note: David Brenner, interviewed for this story, is director of the Center for Radiological Research at the Columbia University Vagelos College of Physicians and Surgeons.

“We have already invested all of this money to begin these studies which were grounded in evidence and peer-reviewed as scientifically superior,” said Rebecca Schnall.