1. Clinical history provides critical information 2. Target problem appropriately identified 3. Design allowed for the examination of cause-and-effect relationship 4. Block adequacy was confirmed by sensory changes (sensitivity to pinprick, touch, etc) 5. Adequate baseline measurements 6. Number of treatment visits > 1 7. Individual data from pre-treatment and post-treatment phases 8. Statistical analyses of the multiple measurements made during pre-treatment, treatment, and post-treatment phases of the case 9. Replication of results in other patients presented in the article. *mostly based on Tate et al. [8]

Table 1: Criteria of methodological quality assessment for case reports or case series*.