1 From the Copenhagen Neuromuscular Center (J.V.), Rigshospitalet, University of Copenhagen, Denmark; and Fondazione San Camillo Hospital IRCCS (C.A.), Lido Venice, Italy. vissing@rh.dk.
2 From the Copenhagen Neuromuscular Center (J.V.), Rigshospitalet, University of Copenhagen, Denmark; and Fondazione San Camillo Hospital IRCCS (C.A.), Lido Venice, Italy.