“…Of the 20 studies, 9 studies [1,4,6,7,9,11,15,16] were randomized into groups using the random number table method, 1 study [13] was randomized into groups through random toss, 1 study [2] Figure was randomized according to the order of treatment, and 9 studies [3,5,8,10,12,14,17,18] did not mention the specific randomization method. Of the 20 studies, 1 study [6] used allocation concealment, whereas 19 studies [1][2][3][4][5][7][8][9][10][11][12][13][14][15][16][17][18] did not mention allocation concealment. Owing to the specificity of acupuncture operation, the studies displayed a high risk of bias in terms of blinding of participants and personnel: 1 study [5] used the double-blinding method, 1 study [6] used the single-blinding method, and 18 studies [1][2][3][4][6][7][8][9]…”