Randomization
Permuted block randomization (block sizes of 2/4/6) was used. After baseline assessments, participants were randomly assigned to two groups at a ratio of 1:1 according to the randomization sequence. The randomization sequence was generated by an independent biostatistician using Microsoft Excel prior to study initiation. Individual randomization code was sealed in sequentially numbered opaque envelopes and opened by acupuncturist after participants completed baseline assessments.