P Maki, T Riekki, J Miettunen, M Isohanni, P. B Jones, G. K Murray and J. Veijola
American Journal of Psychiatry 167 ( 1 ): 70 - 77 , 2010
J Welham, M Isohanni, P Jones and J. McGrath
Schizophrenia Bulletin 35 ( 3 ): 603 - 623 , 2009