Abbreviations
| AIS | ASIA Impairment Scale |
| AS | Ashworth Scale |
| ASIA | American Spinal Injury Association |
| AMSTAR | A MeaSurement Tool to Assess systematic Reviews |
| BPI | Brief Pain Inventory |
| CBD | cannabidiol |
| CDC | Centre for Disease Control |
| CGI | Clinician Global Impression |
| CI | confidence interval |
| CINAHL | Cumulative Index to Nursing and Allied Health Literature |
| COPD | chronic obstructive pulmonary disease |
| FDA | Food and Drug Administration |
| MA | meta-analysis |
| MAS | Modified Ashworth Scale |
| NAS | National Academy of the Sciences |
| NIH | National Institute of Health |
| NRS | Numeric Rating Scale |
| n.d. | not dated |
| PEA | palmitoylethanolamide |
| PEDro | Physiotherapy Evidence Database |
| PGIC | Patient Global Impression of Change |
| PMS | Profile of Moods Scales |
| PRISMA | Preferred Reviews and Meta-Analysis |
| SCI | Spinal Cord Injury |
| SFS | Spasm Frequency Scale |
| SGI | Subject Global Impression |
| SMD | statistical mean difference |
| SR | systematic review |
| SSS | statistical sum score |
| THC | delta-9-tetrahydrocannabinol |
| VAS | Visual Analog Scale |
| WMS | Wechsler Memory Scale |
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