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Visual analogue scale (VAS) scores over the test period. One-way analysis of variance was used to compare the VAS scores between 0 min, 10 min, 20 min and 30 min. Data are expressed as mean ± SD. ▲P < 0.05 among 0 min, 10 min, 20 min and 30 min. ■P < 0.05 versus 10 min. ♦P < 0.05 versus 20 min.
