1 Sydney Medical School, University of Sydney, Sydney, NSW, Australia; Department of Cardiology, Concord Hospital and Anzac Research Institute, Concord, NSW 2137, Australia. Electronic address: ben.freedman@sydney.edu.au.
2 Institute for Epidemiology, Statistics and Informatics, Frankfurt, Germany.
3 Sydney Medical School, University of Sydney, Sydney, NSW, Australia; Department of Cardiology, Concord Hospital and Anzac Research Institute, Concord, NSW 2137, Australia.
4 Sydney Nursing School, Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia.