Reduced cortical folding in schizophrenia: an MRI morphometric study - Sallet, Paulo C.; Elkis, Hélio; Alves, Tânia M.; Oliveira, José R.; Sassi, Erlei; Castro, Claudio Campi; Busatto, Geraldo F.; Gattaz, Wagner F. (The American Journal of Psychiatry, 2003)