In a single-blind , randomized controlled trial , 43 patients with PSD were randomly assigned to 12 sessions of DCEAS plus SSRI plus body electroacupuncture ( n = 23 ) , or sham ( non-invasive cranial electroacupuncture , n-CEA ) plus SSRI plus body electroacupuncture ( n = 20 ) for 3 sessions per week over 4 weeks .