A large population cohort provides normative data for investigation of temperament. - Miettunen, J.; Kantojärvi, L.; Ekelund, J.; Veijola, J.; Karvonen, J. T.; Peltonen, L.; Järvelin, M. R.; Freimer, N.; Lichtermann, D.; Joukamaa, M. (Acta Psychiatrica Scandinavica, 2004)