Olanzapine versus placebo in the treatment of acute mania. Olanzapine HGEH Study Group. - Tohen,M.; Sanger,T.M.; McElroy,S.L.; Tollefson,G.D.; Chengappa,K.N.; Daniel,D.G.; Petty,F.; Centorrino,F.; Wang,R.; Grundy,S.L.; Greaney,M.G.; Jacobs,T.G.; et al. (Am J Psychiatry, 1999)