Beyond the critical period: longitudinal study of 8-year outcome in first-episode non-affective psychosis. - Crumlish, Niall; Whitty, Peter; Clarke, Mary; Browne, Stephen; Kamali, Moayyad; Gervin, Maurice; McTigue, Orfhlaith; Kinsella, Anthony; Waddington, John L.; Larkin, Cornall; O'Callaghan, Eadbhard; Larkin, Conall (British Journal of Psychiatry, 2009)