Intra- and interindividual attack frequency variability of chronic cluster headache.
Authors
Brandt RB, Mulleners W, Wilbrink LA, Brandt P, van Zwet EW, Huygen FJ, Ferrari MD, Fronczek R
Abstract
The lack of knowledge about the intra- and interindividual attack frequency variability in chronic cluster headache complicates power and sample size calculations for baseline periods of trials, and consensus on their most optimal duration.
