Core Health Outcomes In Childhood Epilepsy (CHOICE): protocol for the selection of a core outcome set oleh Christopher Morris, Colin Dunkley, Frances M. Gibbon, Janet Currier, Deborah Roberts, Morwenna Rogers, Holly Crudgington, Lucy Bray, Bernie Carter, Dyfrig Hughes, Catrin Tudur Smith, Paula R. Williamson, Paul Gringras, Deb K. Pal