1 University of Adelaide, The Queen Elizabeth Hospital, Adelaide, SA Australia. Electronic address: https://twitter.com/josh_kovoor.
2 Heart of the Nation, Sydney, NSW, Australia. Electronic address: https://twitter.com/GregPage_Yellow.
3 Department of Emergency Medicine, Oregon Health and Science University, Portland, OR, USA.
4 Center for Cardiac Arrest Prevention, Smidt Heart Institute, Cedars-Sinai Health System, Los Angeles, CA, USA. Electronic address: https://twitter.com/SumeetSChugh.
5 Department of Cardiology, Westmead Hospital, Sydney, NSW, Australia; University of Sydney, Sydney, NSW, Australia. Electronic address: [email protected].