 STUDY EVALUATIONS STRUCTURED CLINICAL INTERVIEW FOR DSM-IV SCID The structured clinical interview for DSM-III-R SCID-R Spitzer et al. 1990 see appendix D will be used to confirm diagnosis for patients entering the study. This will be performed by the treating doctor prior to randomisation. It consists of a structured interview in which the doctor asks set questions regarding symptoms and then rates the reply on a three point scale where 1 absent or false and 3 threshold or true. 