EAN Guideline on Palliative Care of People with Severe, Progressive Multiple Sclerosis - Solari, Alessandra (Fondazione IRCCS Istituto Neurologico Carlo Besta) ; Giordano, Andrea (University of Turin) ; Sastre-Garriga, Jaume (Hospital Universitari Vall d'Hebron) ; Köpke, Sascha (University Medical Center Hamburg-Eppendorf) ; Rahn, Anne Christin (University Medical Center Hamburg-Eppendorf) ; Kleiter, Ingo (Marianne-Strauß-Klinik) ; Aleksovska, Katina (European Academy of Neurology (Austria)) ; Battaglia, Mario A. (University of Siena) ; Bay, Jette (People with MS Advisory Committee (Dinamarca)) ; Copetti, Massimiliano (Fondazione IRCCS Casa Sollievo della Sofferenza) ; Drulovic, Jelena (University of Belgrade) ; Kooij, Liesbeth (Nieuw Unicum, Zandvoort) ; Mens, John (Nieuw Unicum) ; Murillo, Edwin R. Meza (Hospital Universitari Vall d'Hebron) ; Milanov, Ivan (Medical University of Sofia) ; Milo, Ron (Ben-Gurion University of the Negev) ; Pekmezovic, Tatiana (University of Belgrade) ; Vosburgh, Janine (Israel Multiple Sclerosis Society) ; Silber, Eli (King's College Hospital NHS Foundation Trust) ; Veronese, Simone (FARO Charitable Foundation) ; Patti, Francesco (University Hospital Policlinico Vittorio Emanuele) ; Voltz, Raymond (University of Cologne) ; Oliver, David J. (University of Kent, Canterbury) ; Universitat Autònoma de Barcelona