Table 1.

EMBASE search strategy

No	Searching item
1	Clinical article
2	Clinical study
3	Clinical trial
4	Controlled study
5	Randomized controlled trials
6	Major clinical study
7	Double blind method
8	Multicenter study
9	Single blind method
10	Crossover procedure
11	Placebo
12	Or/1–11
13	Erectile dysfunction
14	Impotence
15	Erection failure
16	Male sexual dysfunction
17	Penis erection
18	Or/13–17
19	Exp ACUPUNCTURE
20	acupuncture.tw
21	electroacupuncture.tw.
22	Exp Acupuncture Therapy
23	Fire needling
24	Elongated needle
25	Intradermal needling
26	Scalp acupuncture
27	Ear acupuncture
28	Dry needling
29	Or/19–28
30	12 and 18 and 29