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The brain age gap as a function of the chronological age using four different machine‐learning methods: Penalized ridge regression (ridge), support vector regression (SVR), Gaussian processes regression (GPR) and deep neural network (DNN). All the models showed overestimation in younger subjects and underestimation in older subjects. The shaded area along the regression line indicates the 95% prediction interval [Color figure can be viewed at http://wileyonlinelibrary.com]
