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| Methods | Randomized, prospective study |
| Participants | A total of 113 patients referred for lumbar, thoracic, cervical or total column myelography |
| Interventions | Participants were numbered sequentially; in even‐numbered patients a 22 G needle was used and for odd‐numbered patients, a 25 G needle |
| Outcomes | The primary outcome was the incidence of headache following myelography. Secondary outcomes were: the influence of needle type, sex, myelogram type and operators. |
| Notes | — |
