1 Department of Emergency Medicine, Baylor College of Medicine, Houston, Texas, USA.
2 Department of Medicine, Baylor College of Medicine, Houston, Texas, USA.
3 Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey VA Medical Center, Houston, Texas, USA.
4 UT Health Science Center, University of Texas School of Public Health, Houston, Texas, USA.
5 School of Medicine, Baylor College of Medicine, Houston, Texas, USA.
6 Department of Emergency Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.
7 University of Texas Health Science Center, Consortium on Aging, Houston, Texas, USA.
8 Department of Emergency Medicine, Barnes Jewish Hospital, Washington University School of Medicine, Emergency Care Research Core, St. Louis, Missouri, USA.
9 Department of Emergency Medicine, Harvard Medical School, Boston, Massachusetts, USA.