Development of an international Core Outcome Set (COS) for best care for the dying person: study protocol oleh Sofia C. Zambrano, Dagny Faksvåg Haugen, Agnes van der Heide, Vilma A. Tripodoro, John Ellershaw, Carl Johan Fürst, Raymond Voltz, Stephen Mason, María L. Daud, Gustavo De Simone, Kerstin Kremeike, Svandis Iris Halfdanardottir, Valgerdur Sigurdardottir, Jeremy Johnson, Simon Allan, Haroon Hafeez, Catarina Simões, Katrin Ruth Sigurdardottir, Birgit H. Rasmussen, Paula Williamson, Steffen Eychmüller, in collaboration with the iLIVE consortium