- this crossover study will involve participants who will be randomized into two treatment groups,A&B. TEAS treatments will be given for 30 minutes,X2/week,for 6 weeks(12total sessions). Group A will receive 2 weeks(4 sessions) of active treatment followed by 4 weeks of sham treatment(8 sessions). Group B will receive 2 weeks(4 sessions) of sham treatment,2 weeks (4 sessions)of real treatment,and finally 2 weeks (4 sessions) of sham treatment.