1. From the Department of Respiratory Medicine (F.V., K.A.F.), Umeå University Hospital, Umeå, Sweden; Department of Internal Medicine, Östersund Hospital, Östersund, Sweden, and Department of Public Health and Clinical Medicine, Heart Centre, Umeå University Hospital, Umeå, Sweden (T.M.); Department of Clinical Neurophysiology (T.R.), Umeå University Hospital, Umeå, Sweden; Department of Epidemiology and Public Health (H.S.), Umeå University, Umeå, Sweden; and Department of Biomedical...