Fig. 1From: Phenotype of new daily persistent headache: subtypes and comparison to transformed chronic daily headacheFlowchart of study participants and exclusions. CH, cluster headache; CM, chronic migraine; CTTH, chronic tension-type headache; HC, hemicrania continua; ICHD-3, international classification of headache disorders, 3rd edition; MRI, magnetic resonance imaging; NDPH, new daily persistent headache; SUNA, short-lasting unilateral neuralgiform headache attacksBack to article page