HYPOTHESES It is hypothesized that the use of combination continuation therapies after effective ECT leads to lower HAMD scores and lower relapse rates than the standard treatment with antidepressants alone after 6 months. In addition, we assume that the CBT group will establish more functional macro-patterns than the somatic treatments in the long term and will have the lowest HAMD scores and relapse rates after 1 year. With regard to the cognitive side effects, the autobiographical memory is expected to be the only specific part of memory being affected negatively by ECT in the short and long term.