DR. KAHN and DR. ANGUS are at the clinical research, investigation, and systems modeling of acute illness center in the department of critical care medicine, and in the department of health policy management, at the University of Pittsburgh. Dr. Angus is a contributing editor for JAMA. They reported no financial conflicts of interest. Dr. Kahn is supported by a career development award from the National Institutes of Health. These remarks were adapted from their editorial accompanying Dr. Bell's report (JAMA 2011;306:878-9).