Onabotulinum toxin A block of the sphenopalatine ganglion in patients with persistent idiopathic facial pain: a randomized, triple-blind, placebo-controlled, exploratory, cross-over study.
Kent A JamtøyWenche Moe ThorstensenLars J StovnerAnnika RosénStine MaarbjergDaniel BratbakMelanie R SimpsonErling TronvikPublished in: Cephalalgia : an international journal of headache (2023)
The study protocol is registered in ClinicalTrial.gov (NCT03462290) and EUDRACT (number: 2017-002518-30).