Long-term risk of stroke after transient global amnesia in two prospective cohorts by Romoli, M, Tuna, MA, McGurgan, I, Li, L, Giannandrea, D, Eusebi, P, Caprioli, F, Lotti, A, Salvadori, N, Sarchielli, P, Gili, A, Mosconi, MG, Venti, M, Stracci, F, Ricci, S, Paciaroni, M, Parnetti, L, Calabresi, P, Rothwell, PM