Fountoulakis KN, Dragioti E, Theofilidis AT, Wiklund T, Atmatzidis X, Nimatoudis I, Thys E, Wampers M, Hranov L, Hristova T. Modeling psychological function in patients with schizophrenia with the PANSS: an international multi-center study. CNS Specrtum. 2021;26(3):290 - 298.