1. Berry Consultants, Austin, Texas
2. Berry Consultants, Austin, Texas2Department of Biostatistics, Vanderbilt University School of Medicine, Nashville, Tennessee
3. Berry Consultants, Austin, Texas3Department of Emergency Medicine, Harbor-UCLA Medical Center, Torrance, California4Los Angeles Biomedical Research Institute, Torrance, California5David Geffen School of Medicine, University of California, Los Angeles