Schizophrenia-related neuregulin-1 single-nucleotide polymorphisms lead to deficient smooth eye pursuit in a large sample of young men - Smyrnis, Nikolaos; Kattoulas, Emmanouil; Stefanis, Nicholas C; Avramopoulos, Dimitrios; Stefanis, Costas N; Evdokimidis, Ioannis (Schizophrenia bulletin, 2009)