<qa>  What is the name of the subject that has a pacemaker or significant claustroSubjects will also be excluded if they had any significant comorbid condition in the last year, c psychosis to the extent that the ability to provide informed consent is in doubt, d history of any major psychiatric disorder other than the target mood disorder arising temporally before the initial mood episode, e medical or neurological illnesses i.e. seizure disorder, a coma in past likely to affect physiology or anatomy, f a history of drug or alcohol abuse within 1 year or a lifetime history of alcohol or drug dependence DSM IV criteria, g are HIV positive or have AIDS, h current pregnancy documented by history and pregnancy testing prior to scanning, i current breast feeding, j general MRI exclusion criteria which include the subject having a pacemaker or significant claustrophobia and k if they are smokers. 