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Esteban-Cornejo, I., Catena, A., Hillman, C.H., Kramer, A.F., Erickson, K.I. & Ortega, F. (2018). Commentary: At least eighty percent of brain grey matter is modifiable by physical activity: a review study. Frontiers in Human Neuroscience, 12(195), doi: 10.3389/fnhum.2018.00195.