title: Hemicrania continua and unilateral headaches: are they still together in the IHS classification?
authors.affiliation: Headache Centre, C. Mondino National Institute of Neurology Foundation, IRCCS, Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy. fabio.antonaci@unipv.it.
authors.forename: Fabio
authors.initials: F
authors.lastname: Antonaci
authors.affiliation: Department of Neurology, St. Olavs Hospital, Trondheim University Hospitals, NTNU, Trondheim, Norway.
authors.forename: Ottar
authors.initials: O
authors.lastname: Sjaastad
authors.affiliation: Department of Neurosurgery, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway.
authors.forename: Torbjorn A
authors.initials: TA
authors.lastname: Fredriksen