1. From the Department of Neurology (B.N.), University Hospital, Lund, Sweden; Department of Medicine (P.W.), University Hospital, Umeå, Sweden; Institute of Neuroscience and Physiology/Rehabilitation Medicine (K.S.S.), Sahlgrenska Academy at Göteborg University, Göteborg, Sweden; National Board of Health and Welfare (A.S., F.B., P.O.W., K.A.), Stockholm, Sweden.