Theory of Mind as a potential trait marker of schizophrenia: a family study - Pentaraki, AD; Stefanis, NC; Stahl, D; Theleritis, C; Toulopoulou, T; Roukas, D; Kaliora, SC; Chatzimanolis, I; Smyrnis, N; Russell, T; others (Cognitive neuropsychiatry, 2012)