Table 1: Standards for reporting interventions in controlled trials of acupuncture (STRICTA).

Acupuncture rationale(1) According to the selection of local points, and meridian theory of traditional Chinese medicine
(2) Classic acupoints: CV3 (Zhongji), CV4 (Guanyuan), ST36 (Zusanli), SP6 (Sanyinjiao)

Needling detail(1) Single or bilateral acupoints
(2) Six needles inserted
(3) Depth of insertion: muscle layer in electroacupuncture (EA) group, and subcutaneous tissue in sham EA group
(4) Responses elicited: obtain qi and visible twitching of muscle in EA group, and no responses elicited in  sham EA group
(5) Needle stimulation: manual to obtain qi following by electrical stimulation in EA group, and no  manual or any electrical stimulation in sham EA group
(6) Needle retention time: 20 min
(7) Needle type: stainless steel needles, 2 cun in length, gauge#30, Yu Huang, Taiwan

Treatment regimen(1) Twice per week for 6 weeks

Cointerventions(1) None: no herbs, moxibustion, cupping, massage, exercise, advice dietary or lifestyle modification

Practitioner background(1) License-certificated Chinese medical doctor with more than four years of acupuncture experience

Control intervention(1) Nil