Group II: Patients receive 9 sessions of sham stimulation, which consists of 8 minutes of sham stimulation during session 1, 12 minutes duration sham stimulation during session 2, and 16 minutes duration sham stimulation during sessions 3-9. The total duration of sham stimulation is 132 minutes. Each session was given conducted on a separate day and in general each session occured on consecutive days with the exception of weekends.