What do patients consider to be the most important outcomes for effectiveness studies on migraine treatment? Results of a Delphi study. oleh Antonia F H Smelt, Mark A Louter, Dennis A Kies, Jeanet W Blom, Gisela M Terwindt, Geert J M G van der Heijden, Véronique De Gucht, Michel D Ferrari, Willem J J Assendelft