1 The Permanente Medical Group, Oakland, California, USA.
2 Kaiser Permanente Division of Research, Oakland, California, USA.
3 The CREST Network, Oakland, California, USA.
4 Department of Emergency Medicine, Kaiser Permanente Sacramento Medical Center, Sacramento, California, USA.
5 Center for Policy and Research in Emergency Medicine, Department of Emergency Medicine, Oregon Health and Science University, Portland, Oregon, USA.
6 Arrhythmia Division, Spanish Society of Emergency Medicine, Madrid, Spain.
7 Emergency Area Research Group, Hospital Clinic, Barcelona, Spain.
8 Department of Emergency Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
9 Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada.
10 Division of Emergency Medicine, Department of Medicine, the Institute for Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada.
11 Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.