Combination training in aging individuals modifies functional connectivity and cognition, and is potentially affected by dopamine-related genes by Pieramico, V, Esposito, R, Sensi, F, Cilli, F, Mantini, D, Mattei, P, Frazzini, V, Ciavardelli, D, Gatta, V, Ferretti, A, Romani, G, Sensi, S