*3.7. Adverse Events (AEs)*

AEs were also assessed in the present study. Based on the comparisons, AE rates are summarized as follows. Reported AEs according to RCT design are as follows: (1) ELEC vs. CONV design: 3/30 AEs in the ELEC group vs. 12/30 AEs in the CONV group were reported (Chen 2012 [14]); (2) MANU vs. CONV: not reported; (3) BEEV vs. CONV: 1/18 AEs in the BEEV group were reported (Cho 2012 [41]); (4) ELEC vs. SHAM: not reported; (5) MANU vs. SHAM: 1/47 in the MANU group was reported (Kluger 2016 [43]); and (6) BEEV vs. SHAM: 4/20 AEs in the BEEV group were reported (Hartmann 2016 [39]).
