Primary and secondary outcome measures.

<p>Primary and secondary outcome measures.</p

Baseline characteristics of the participants.

<p>Baseline characteristics of the participants.</p

Mean Northwick Park Neck Pain Questionnaire (NPQ) scores in both groups over time.

<p>Groups A and S, patients treated by abdominal and sham abdominal acupuncture, respectively. Data are expressed as mean values and 95% confidence intervals.</p

Acupuncture points used in this study.

<p>Acupuncture points used in this study.</p

Blinding assessment findings.

<p>Blinding assessment findings.</p

Overview of adverse events.

<p>Overview of adverse events.</p