Department of Immunology, Royal Adelaide Hospital, Adelaide, South Australia, Australia. Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia. Department of Cardiothoracic Surgery, Flinders Medical Centre, Bedford Park, South Australia, Australia. Department of Neurology, Royal Adelaide Hospital, Adelaide, South Australia, Australia. Gold Coast University Hospital, Southport, Queensland, Australia. Department of Neurology, Flinders Medical Centre, Bedford Park, South Australia, Australia.