1 Department of General Medicine, Sydney Eye Hospital, Sydney Hospital, Sydney, AustraliaDepartment of General Medicine, Sydney Eye Hospital, Sydney Hospital, Sydney, AustraliaDepartment of Cardiology, St Vincent's Hospital, Darlinghurst, AustraliaDepartment of General Medicine, Sydney Eye Hospital, Sydney Hospital, Sydney, AustraliaDepartment of Neurology, St Vincent's Hospital, Darlinghurst, Australia.