Common variants conferring risk of schizophrenia - Stefansson, H; Ophoff, RA; Steinberg, S; Andreassen, OA; Cichon, S; Rujescu, D; Werge, T; Pietilainen, OPH; Mors, O; Mortensen, PB; Sigurdsson, E; Gustafsson, O; et al. (NATURE, 2009)