From the Radiology Unit (P.P., V.I., V.G., S.R., R.V.), Medical Physics Unit (A.N.), Epidemiology Unit (P.G.R.), Scientific Directorate (L.B., S.C.), and Screening Coordinating Centre (C.C.), AUSL Reggio Emilia, IRCCS, Via Amendola 2, Reggio Emilia 42122, Italy. (At 2018-08)