1. Clinical Research, Investigation, and Systems Modeling of Acute Illness Center, Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
2. Department of Health Policy & Management, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania
3. Dartmouth Institute of Health Policy & Clinical Practice, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire; and
4. Department of Health Policy, Management, and Leadership, West Virginia University School of Public Health, Morgantown, West Virginia