| CH | Cluster Headache |
| ET-1 | Endothelin-1 |
| 5-HT | Serotonin Receptors |
| MG | Migraine Headache |
| CGRP | Calcitonin Gene-Related Peptide |
| PAG | Periaqueductal Gray |
| QST | Quantitative Sensory Tests |
| TCC | Trigemino-Cervical Complex |
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