Is it time to revise the diagnostic criteria for apathy in brain disorders? The 2018 international consensus group by Robert, P, Lanctôt, K, Agüera-Ortiz, L, Aalten, P, Bremond, F, Defrancesco, M, Hanon, C, David, R, Dubois, B, Dujardin, K, Husain, M, König, A, Levy, R, Mantua, V, Meulien, D, Miller, D, Moebius, H, Rasmussen, J, Robert, G, Ruthirakuhan, M, Stella, F, Yesavage, J, Zeghari, R, Manera, V