1. The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Lebanon, NH (N.R., A.I., T.A.M.).
2. Section of Cardiac Surgery, Department of Surgery (A.I., E.O., D.M.), Dartmouth-Hitchcock Medical Center, Lebanon, NH.
3. Department of Quantitative Biomedical Sciences, Geisel School of Medicine at Dartmouth, Hanover, NH (N.R., A.I., T.A.M).
4. Section of Cardiology, Department of Medicine (D.M.), Dartmouth-Hitchcock Medical Center, Lebanon, NH.