Effect of schizotypy on cognitive performance and its tuning by COMT val158 met genotype variations in a large population of young men - Smyrnis, Nikolaos; Avramopoulos, Dimitrios; Evdokimidis, Ioannis; Stefanis, Costas N; Tsekou, Hara; Stefanis, Nicholas C (Biological Psychiatry, 2007)