| Referring physician | Frequency | Percentage (%) |
| Neurosurgeon | 74 | 33.6 |
| Neurologist | 51 | 23.1 |
| Rheumatologist | 30 | 13.6 |
| Orthopedic surgeon | 21 | 9.5 |
| General practitioner | 21 | 9.5 |
| Not mentioned | 16 | 7.2 |
| Anesthesiologist | 4 | 1.8 |
| Pediatric neurologist | 3 | 1.3 |
| Total | 220 | 100 |