1. From the Division of Hematology and Oncology (S.U.T.) and the Department of Internal Medicine (S.U.T., C.E.G.), Perelman School of Medicine, and the Leonard Davis Institute of Health Economics (S.U.T., C.E.G.), University of Pennsylvania, Philadelphia; and the Division of Health Policy and Economics, Department of Population Health Sciences, Weill Medical College, Cornell University, New York (W.L.S.).