By Vincent J. Markovchick, Peter T. Pons, Richard E. Wolfe (all from the Department of Emergency Medicine, Denver General Hospital, Denver, Colorado, USA)
By Ross Vasta, etc., Marshall Haith (University of Denver, Colorado, USA), Scott Miller (University of Florida
By Jessica Pierce (Center for Bioethics and Humanities, University of Colorado Denver, Anchutz Medical Campus in Denver, Colorado, USA)