Stefanis NC, Vitoratou S, Ntzoufras I, Smyrnis N, Evdokimidis I, Stefanis CN. Psychometric properties of the Greek version of the Schizotypal Personality Questionnaire (SPQ) in young male obligatory conscripts: a two years test?retest study. Personality and Individual Differences. 2006;41:1275?1286.