1. University of Texas Southwestern Medical Center, Dallas, Texas (S.J., R.K.)
2. Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, and Yale School of Medicine, New Haven, Connecticut (Z.L., J.S.R.)
3. Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, Yale School of Medicine, and Yale School of Public Health, New Haven, Connecticut (H.M.K.)