Amisulpride and olanzapine followed by open-label treatment with clozapine in first-episode schizophrenia and schizophreniform disorder (OPTiMiSE): a three-phase switching study

René S Kahn, Inge Winter van Rossum, Stefan Leucht, Philip McGuire, Shon W Lewis, Marion Leboyer, Celso Arango, Paola Dazzan, Richard Drake, Stephan Heres, Covadonga M Díaz-Caneja, Dan Rujescu, Mark Weiser, Silvana Galderisi, Birte Glenthøj, Marinus J C Eijkemans, W Wolfgang Fleischhacker, Shitij Kapur, Iris E Sommer, OPTiMiSE study group