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Sample size estimation and allocation
| Stage | Randomisation | Sample size | Total |
| Stage 1 | 1:1:1 | 30 (NA), 30 (AA), 30 (PA) | 90 |
| Stage 2 | 1:2 | 36 (NA), 72 (AA or PA) | 108 |
| Total | 198 |
AA, auricular acupuncture; NA, no acupuncture; PA, peripheral acupuncture.
