| | Study | Main Acupoints | Acupuncture type | Reinforcing and reducing | Retention time |
| | Dong et al., 2020 [36] | EX-HN3 (Yintang), PC 6 (Neiguan), SP 6 (Sanyinjiao), DU 20 (Baihui),GB 20 (Fengchi), GB 12 (Wangu), BL 10 (Tianzhu) | MA1 | Mild supplementing and reducing | 30 min | | Li et al., 2020 [37] | GB 20 (Fengchi), DU 20 (Baihui), DU 21 (Qianding), DU 19 (Houding, EX-HN5 (Taiyang) | MA | Mild supplementing and reducing | 30 min | | Zhang et al., 2020 [38] | GB 20 (Fengchi), DU 16 (Fengfu), DU 20 (Baihui), GB 12 (Wangu), BL 10 (Tianzhu) | MA | Mild supplementing and reducing | 30 min | | Deng et al., 2019 [39] | GB 20 (Fengchi), GB 12 (Wangu), BL 10 (Tianzhu), DU 20 (Baihui), LR 3 (Taichong), GB 39 (Xuanzhong), ST 8 (Touwei), PC 6 (Neiguan), EX-HN3 (Yintang), ST 36 (Zusanli), RN6 (Qihai), RN 4 (Guanyuan) | MA | Mild supplementing and reducing | 30 min | | Dang et al., 2018 [40] | DU 20 (Baihui), GB 20 (Fengchi), BL 2 (Cuanzhu) | MA | — | — | | Zhang et al., 2017 [41] | Faxuan, Xuanhuan | MA | Mild supplementing and reducing | 30 min | | Zhou and Gao, 2017 [42] | GB 20 (Fengchi) | MA | Mild supplementing and reducing | 30 min | | Chai, 2016 [43] | GB 20 (Fengchi), SI 15 (Jianzhongshu) | MA | Mild supplementing and reducing | 20 min | | Chen et al., 2016 [44] | GB 20 (Fengchi), Gongxue, EX-HN14 (Yiming) | MA + EA2 | Mild supplementing and reducing, sparse-dense wave | 30 min | | Geng et al., 2016 [45] | GB 20 (Fengchi), DU 20 (Baihui), PC 6 (Neiguan) | MA | Mild supplementing and reducing | 30 min | | Tian 2014 | RN 17 (Danzhong), RN 12 (Zhongwan), RN6 (Qihai), ST 36 (Zusanli), SP 10 (Xuehai), SJ 5 (Waiguan) | MA | Mild supplementing and reducing | — | | Zhang et al., 2014 [46] | GB 20 (Fengchi), Gongxue | MA + EA | Mild supplementing and reducing, sparse-dense wave with 2 Hz | 30 min | | Zhou et al., 2014 [47] | Faxuan, Longji, Xiangling | MA | — | — | | Cheng et al., 2013 [48] | GB 20 (Fengchi), DU 20 (Baihui), DU 14 (Dazhui), DU 16 (Fengfu), DU 23 (Shangxing), BL 17 (Geshu), Gongxue, Ashi | MA | Mild supplementing and reducing | — | | Qian et al., 2013 [49] | GB 20 (Fengchi), DU 20 (Baihui), PC 6 (Neiguan), LR 3 (Taichong), BL 18 (Ganshu), BL 23 (Shenshu) | MA | Mild supplementing and reducing | 30 min | | Wang, 2013 [50] | GB 20 (Fengchi), GB 12 (Wangu), BL 10 (Tianzhu), DU 20 (Baihui), EX-HN1 (Sishencong) | MA | Mild supplementing and reducing | 30 min | | Li et al., 2012 [51] | LR 3 (Taichong) | MA | Mild supplementing and reducing | 20 min | | Liu et al., 2012 [52] | DU 20 (Baihui), EX-B2 (Cervical Jiaji) | MA + EA | Sparse-dense wave | 30 min | | Ma and Zhang, 2012 [53] | GB 20 (Fengchi), DU 20 (Baihui), BL 10 (Tianzhu), EX-HN1 (Sishencong) | MA | Mild supplementing and reducing | — | | Luo, 2010 [54] | DU 20 (Baihui), DU 26 (Shuigou), DU 14 (Dazhui), RN 24 (Chengjiang), RN 4 (Guanyuan), RN 6 (Qihai) | MA | — | 30 min | | Gao and Zhao, 2009 [55] | GB 20 (Fengchi), DU 16 (Fengfu), EX-HN14 (Yiming), Gongxue | MA | — | 30 min |
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