Fig. 2From: Ma’s bamboo-based medicinal moxibustion therapy of low back pain in lumbar disc herniation: study protocol for a randomized controlled trialThe SPIRIT figure. The schedule of enrollment, interventions, and assessments. VAS, visual analog scale; S-EP, β-endorphin; SP, substance P; ODI, Oswestry disability index; M-JOA, modified Japanese Orthopaedic Association low back pain score; ECG, electrocardiogramBack to article page