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*.