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Schedule for the enrolment and intervention. Schedule for enrolment and intervention per cluster. G-DN, dry needle group; G-PNE, percutaneous needle electrolysis group; -t1, baseline; t1–t2, intervention period; T2, 8 weeks after baseline; t3, after baseline; T3, 10 weeks after baseline; t4, after baseline; T4, 3 months after baseline; US, ultrasound; VAS, Visual Analogue Scale.
