Effects of stimulus intensity and electrode placement on the efficacy and cognitive effects of electroconvulsive therapy - Sackeim,H.A.; Prudic,J.; Devanand,D.P.; Kiersky,J.E.; Fitzsimons,L.; Moody,B.J.; McElhiney,M.C.; Coleman,E.A.; Settembrino,J.M. (N Engl J Med, 1993)