Editor’s Note: H. Gilbert Welch is a general internist in the Center for Surgery and Public Health at Brigham and Women’s Hospital and author of “Less Medicine, More Health.” Vinay Prasad is an oncologist, associate professor of medicine at Oregon Health and Science University and author of “Malignant: How Bad Policy and Bad Medicine Harm People With Cancer.” The opinions expressed in this commentary are those of the authors; view more opinion articles on CNN.