Fig. 3From: Efficacy and safety of polydioxanone thread embedded at specific acupoints for non-specific chronic neck pain: a study protocol for a randomized, subject-assessor-blinded, sham-controlled pilot trialThread-embedding acupuncture (TEA) device. a: needle used for real TEA. b: needle used for sham TEA (without polydioxanone (PDO) thread)Back to article page