1. From the Division of Physiotherapy (A.-M.T., L.W.H., L.v.K.) and the Unit of Neuroepidemiology and Health Services Research (A.-M.T., L.W.H., J.d.P.-C., L.v.K.), Division of Neurology, Neurotec Department, Karolinska Institutet, Stockholm, Sweden; and the National Center for Epidemiology (J.d.P.-C.), Carlos III Institute of Health, Madrid, Spain.