Long-term follow-up of a group at ultra high risk ("prodromal") for psychosis: the PACE 400 study. - Nelson B; Yuen HP; Wood SJ; Lin A; Spiliotacopoulos D; Bruxner A; Broussard C; Simmons M; Foley DL; Brewer WJ; Francey SM; Amminger GP; et al. (JAMA psychiatry, 2013)